CDC Debezium Supplier, Source Boot Starter

- Add supplier, source and boot auto-config.
 - Add work around for KafkaNull handling.
 - Update CDC to 1.2.1.Final. Replace the deprecated properties.

remove comments

Add missing metadata configuration. Improve README docs.

CDC: add all metadata for doc auto-generation

Remove custom KafkaNullConverter.

  - The fixed KafkaNullConverter implementation comes with kafka binder 3.0.8-BUILD-SNAPSHOT or newer.

Add repositories to maven config in app generation project.

Remove the unnecessary function version in maven plugin configuration for app generation.

function-dependencies/pom.xml

@@ -15,6 +15,11 @@
 
     <dependencyManagement>
         <dependencies>
+            <dependency>
+                <groupId>org.springframework.cloud.fn</groupId>
+                <artifactId>cdc-debezium-supplier</artifactId>
+                <version>${project.version}</version>
+            </dependency>
             <dependency>
                 <groupId>org.springframework.cloud.fn</groupId>
                 <artifactId>file-supplier</artifactId>
@@ -244,4 +249,4 @@
         </dependencies>
 
     </dependencyManagement>
-</project>
+</project>