[Improve][DynamoDb] Dynamodb client supports endpointOverride and create credentials from container or system env.

[joyCurry30]

Purpose of this pull request

In AWS DynamoDB, the endpoint can be overridden, meaning the region is not required. AWS services can automatically derive the endpoint based on the region, making the url parameter optional as well. Additionally, when retrieving credentials for DynamoDB, it is possible to obtain them directly from the container, which will automatically scan the system’s environment variables for the necessary parameters.

Does this PR introduce any user-facing change?

How was this patch tested?

Check list

• If any new Jar binary package adding in your PR, please add License Notice according
  New License Guide
• If necessary, please update the documentation to describe the new feature. https://github.com/apache/seatunnel/tree/dev/docs
• If you are contributing the connector code, please check that the following files are updated:
  1. Update plugin-mapping.properties and add new connector information in it
  2. Update the pom file of seatunnel-dist
  3. Add ci label in label-scope-conf
  4. Add e2e testcase in seatunnel-e2e
  5. Update connector plugin_config
• Update the release-note.

[joyCurry30]

Hi @liunaijie @hailin0 @Hisoka-X, could you please review this PR? Any feedback would be greatly appreciated! Thanks a lot!

[joyCurry30]

As credentials, refer to https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/credentials-providers.html

[liunaijie]

wait for ci pass

[joyCurry30]

I just update doc. Remove the ambiguous description of 'url'.

[Hisoka-X]

Thanks @joyCurry30 ! Please add test case in

seatunnel/seatunnel-e2e/seatunnel-connector-v2-e2e/connector-amazondynamodb-e2e/src/test/java/org/apache/seatunnel/e2e/connector/amazondynamodb/AmazondynamodbIT.java

Line 97 in b5e5d00

public void testAmazondynamodb(TestContainer container) throws Exception {

.