Streamline and refactor the azure and the azure-web adapters.

- Add SCF/Azure Gradle sample and docs.
- Move the function-azure-di-samples into standalone projects.
 - Apply the name convetion and project structure for the SCF adaptes.
   E.g.  function-sample-azure-XXX projects under the spring-cloud-function-samples root.
 - Remove the redudant samples.
 - Improve the samples docs and the Adapter generic docs.
- Streamline docs.
- Add azure web adapter sample and README.
- Add Spring Azure Functions banner for azure and azure web adapters.
- azure-web adapter fixes:
  - Fix issues in serverles-web ProxyHttpServletResponse implementation.
  - Remove the custom FunctionClassUtils utils in favor of scf-context/util/FunctionClassUtils.
- Remove redundant files.
- Add FunctionInvoker deprecation annotations.
- Extend the time trigger sample with Retry policies example.

spring-cloud-function-samples/function-sample-azure-blob-trigger/src/main/java/com/example/azure/di/azureblobtriggerdemo/AzureBlobTriggerDemoApplication.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2021-2022 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.example.azure.di.azureblobtriggerdemo;
+
+import java.util.function.Function;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+
+@SpringBootApplication
+public class AzureBlobTriggerDemoApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(AzureBlobTriggerDemoApplication.class, args);
+	}
+
+	@Bean
+	public Function<String, String> uppercase() {
+		return payload -> payload.toUpperCase();
+	}
+}

spring-cloud-function-samples/function-sample-azure-blob-trigger/src/main/java/com/example/azure/di/azureblobtriggerdemo/MyBlobFunction.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright 2021-2022 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.example.azure.di.azureblobtriggerdemo;
+
+import java.util.function.Function;
+
+import com.microsoft.azure.functions.ExecutionContext;
+import com.microsoft.azure.functions.OutputBinding;
+import com.microsoft.azure.functions.annotation.BindingName;
+import com.microsoft.azure.functions.annotation.BlobInput;
+import com.microsoft.azure.functions.annotation.BlobOutput;
+import com.microsoft.azure.functions.annotation.BlobTrigger;
+import com.microsoft.azure.functions.annotation.FunctionName;
+import com.microsoft.azure.functions.annotation.StorageAccount;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+/**
+ * Azure Functions with Azure Storage Blob.
+ * https://docs.microsoft.com/en-us/azure/azure-functions/functions-bindings-storage-blob-trigger?tabs=java
+ * 
+ * The Blob storage binding is part of an extension bundle, which is specified in your host.json project file. 
+ */
+
+@Component
+public class MyBlobFunction {
+
+
+    @Autowired
+    private Function<String, String> uppercase;
+
+    /**
+     * This function will be invoked when a new or updated blob is detected at the specified path. The blob contents are
+     * provided as input to this function. The location of the blob is provided in the path parameter. Example -
+     * test-triggerinput-java/{name} below
+     */
+    @FunctionName("BlobTrigger")
+    @StorageAccount("AzureWebJobsStorage")
+    public void BlobTriggerToBlobTest(
+            @BlobTrigger(name = "triggerBlob", path = "test-triggerinput-java/{name}", dataType = "binary") byte[] triggerBlob,
+            @BindingName("name") String fileName,
+            @BlobInput(name = "inputBlob", path = "test-input-java/{name}", dataType = "binary") byte[] inputBlob,
+            @BlobOutput(name = "outputBlob", path = "test-output-java/{name}", dataType = "binary") OutputBinding<byte[]> outputBlob,
+            final ExecutionContext context) {
+                
+        context.getLogger().info("Java Blob trigger function BlobTriggerToBlobTest processed a blob.\n Name: "
+                + fileName + "\n Size: " + triggerBlob.length + " Bytes");
+        outputBlob.setValue(inputBlob);
+    }
+}

spring-cloud-function-samples/function-sample-azure-blob-trigger/src/main/resources/application.properties

@@ -0,0 +1 @@
+

spring-cloud-function-samples/function-sample-azure-blob-trigger/src/main/resources/host.json

@@ -0,0 +1,7 @@
+{
+    "version": "2.0",
+    "extensionBundle": {
+        "id": "Microsoft.Azure.Functions.ExtensionBundle",
+        "version": "[3.*, 4.0.0)"
+    }
+}

spring-cloud-function-samples/function-sample-azure-blob-trigger/src/main/resources/local.settings.json

@@ -0,0 +1,8 @@
+{
+	"IsEncrypted": false,
+	"Values": {
+		"AzureWebJobsStorage": "UseDevelopmentStorage=true",
+		"AzureWebJobsDashboard": "",
+		"FUNCTIONS_WORKER_RUNTIME": "java"
+	}
+}

spring-cloud-function-samples/function-sample-azure-blob-trigger/src/test/java/com/example/azure/di/azureblobtriggerdemo/AzureBlobTriggerDemoApplicationTests.java

@@ -0,0 +1,13 @@
+package com.example.azure.di.azureblobtriggerdemo;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class AzureBlobTriggerDemoApplicationTests {
+
+	@Test
+	void contextLoads() {
+	}
+
+}