feat(sink): Avro with AWS Glue Schema Registry

[xiangjinwu]

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What's changed and what's your intention?

Supports loading schema from and encoding metadata for AWS Glue Schema Registry, in addition to Confluent Schema Registry, when using encode avro.

Notes:

• Glue Schema Registry has no references (eg import in protobuf).
• Glue Schema Registry has no name strategy. So it would require an additional aws.glue.key_schema_arn. This is left unimplemented in favor of real use case KEY ENCODE [TEXT | BYTES].

Related: #17605 for source

Refactor to come next: {Confluent, Glue} x {Source, Sink} x {Avro, Protobuf}

Checklist

• I have written necessary rustdoc comments.
• I have added necessary unit tests and integration tests.
• I have added test labels as necessary.
• I have added fuzzing tests or opened an issue to track them.
• My PR contains breaking changes.
• My PR changes performance-critical code, so I will run (micro) benchmarks and present the results.
• My PR contains critical fixes that are necessary to be merged into the latest release.

Documentation

• My PR needs documentation updates.

Added support for AWS Glue Schema Registry when using encode avro for sinks:

encode avro (
  aws.glue.schema_arn = 'arn:aws:glue:ap-southeast-1:123456123456:schema/default-registry/MyEvent',
  // other aws auth options same as s3 / kinesis
  aws.region = '...',
  aws.credentials.access_key_id = '...',
  ...
) [KEY ENCODE [TEXT | BYTES]] -- when specifying `primary_key` as kafka key

When using IAM permission policies, the following actions shall be allowed:

• glue:GetSchemaVersion

[xxchan]

Generally LGTM