Add SAM to sample

spring-cloud-function-samples/function-sample-aws/src/main/resources/META-INF/mask.keys

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+routeKey
+rawQueryString
+path
+resource

spring-cloud-function-samples/function-sample-aws/template.yml

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+AWSTemplateFormatVersion: '2010-09-09'
+Transform: AWS::Serverless-2016-10-31
+Description: Example function as lambda deployment
+
+Globals:
+  Api:
+    # API Gateway regional endpoints
+    EndpointConfiguration: REGIONAL
+
+Resources:
+  PetStoreMVC:
+    Type: AWS::Serverless::Function
+    Properties:
+#      AutoPublishAlias: bcn
+      FunctionName: uppercase
+      Handler: org.springframework.cloud.function.adapter.aws.FunctionInvoker::handleRequest
+      Runtime: java17
+      SnapStart:
+        ApplyOn: PublishedVersions
+      CodeUri: .
+      MemorySize: 1024
+      Policies: AWSLambdaBasicExecutionRole
+      Timeout: 30
+      Environment:
+        Variables:
+          MAIN_CLASS: example.FunctionConfiguration
+      Events:
+        HttpApiEvent:
+          Type: HttpApi
+          Properties:
+            TimeoutInMillis: 20000
+            PayloadFormatVersion: '1.0'
+
+Outputs:
+  PetStoreMVCApi:
+    Description: URL for application
+    Value: !Sub 'https://${ServerlessHttpApi}.execute-api.${AWS::Region}.amazonaws.com/uppercase'
+    Export:
+      Name: UppercaseAPI
+      
+