aws-sdk-java-v2 [DRAFT]Provide JSON helper methods to input and output data to DynamoDB in Json Format

Motivation and Context

PR created to review the design approach, will update the java docs and detailed test cases in future revision of this PR
Issue-1862 Preserve JSON helper methods in the DynamoDB Document API #1862
Currently V2 did not have a way to input/output in json format.

Modifications

Added a Public class called JsonItem


 public static JsonItem fromJson(String jsonString) {}
 public static JsonItem fromAttributeValueMap(Map<String, AttributeValue> attributeMap) {}

 public String toJson(){};

 public boolean contains(String key)

 public String toString()

Rest of the classes are Internal.
Added convertors to convert from AttributeValue to Json and vice-versa.

In order to create DDB Enhanced client table which Supports Json , we need to create the Table with Json Schema as below

 TableSchema.withDocumentSchema(
              StaticTableMetadata.builder().addIndexPartitionKey(
                        TableMetadata.primaryIndexName(), "hash-key", AttributeValueType.S).build()));

Note : The StaticTableMetadata needs to be built by the user since we need to specify the Table meta data like primary key and sort key etc , this is one time operation.


        DynamoDbEnhancedClient enhancedClient = DynamoDbEnhancedClient.builder()
                                               .dynamoDbClient(getDynamoDbClient())
                                               .build();

        DynamoDbTable<JsonItem> mappedTable1 = enhancedClient.table(getConcreteTableName("table-name-1"),
                                            TableSchema.withDocumentSchema(
                                                StaticTableMetadata.builder().addIndexPartitionKey(
                                                    TableMetadata.primaryIndexName(), "hash-key", AttributeValueType.S).build()));

        mappedTable1.createTable(r -> r.provisionedThroughput(getDefaultProvisionedThroughput()));


        mappedTable1.putItem(JsonItem.fromJson("{\"hash-key\":\"1234\",\"updateDone\":false}"));

Testing

Junits for put,get,scan, query and delete items.

Todo

Will update the Java docs
Will add more test cases to check how to deal with Bytes

Screenshots (if appropriate)

Types of changes

[ ] Bug fix (non-breaking change which fixes an issue)
[x] New feature (non-breaking change which adds functionality)

Checklist

[ ] I have read the CONTRIBUTING document
[ ] Local run of mvn install succeeds
[ ] My code follows the code style of this project
[ ] My change requires a change to the Javadoc documentation
[ ] I have updated the Javadoc documentation accordingly
[ ] I have added tests to cover my changes
[ ] All new and existing tests passed
[ ] I have added a changelog entry. Adding a new entry must be accomplished by running the scripts/new-change script and following the instructions. Commit the new file created by the script in .changes/next-release with your changes.
[ ] My change is to implement 1.11 parity feature and I have updated LaunchChangelog