[FLINK-24379][Formats] Avro Glue Schema Registry table format

[nicusX]

Purpose of the change

Implement Table API support for Avro with AWS Glue Schema Registry

Verifying this change

• Added unit tests
• Manually verified by running a Flink application locally against a local Kafka cluster and using GSR.

Significant changes

• [x] Dependencies have been added or upgraded
• [ ] Public API has been changed (Public API is any class annotated with @Public(Evolving))
• [ ] Serializers have been changed
• [X] New feature has been introduced
  • If yes, how is this documented? docs

The implementation is mostly based on the original PR to the main Flink repo with minor changes. SQL uber-jar has been added and docs fixed and enriched.