Add runtime support for CockroachDB 23 UDTs

[lukaseder]

CockroachDB 23 has added support for UDTs:

• https://www.cockroachlabs.com/docs/releases/v23.1.html#v23-1-0-sql

Current limitations:

• sql: support user-defined types within user-defined composite types cockroachdb/cockroach#91779
• Syntax error when trying to create a composite type containing an array type cockroachdb/cockroach#109597
• Implement INFORMATION_SCHEMA.USER_DEFINED_TYPES and INFORMATION_SCHEMA.ATTRIBUTES cockroachdb/cockroach#109603
• Populate pg_class and pg_attribute with composite types cockroachdb/cockroach#109675
• Support partial user-defined type inserts and updates cockroachdb/cockroach#109676 (same limitation as Oracle)

Code generation support will be done later:

• Add code generation support for CockroachDB 23 UDTs #15519

[lukaseder]

Looking into improved UDT support per jOOQ 3.19 via #228, so I'll revisit this.

[lukaseder]

Will need to refactor our integration tests to support this, given the limitations:

• sql: support user-defined types within user-defined composite types cockroachdb/cockroach#91779
• Syntax error when trying to create a composite type containing an array type cockroachdb/cockroach#109597
• Implement INFORMATION_SCHEMA.USER_DEFINED_TYPES and INFORMATION_SCHEMA.ATTRIBUTES cockroachdb/cockroach#109603
• Populate pg_class and pg_attribute with composite types cockroachdb/cockroach#109675

[lukaseder]

The integration test refactorings could profit from #8474

[lukaseder]

Found another very significant limitation preventing code generation:

• Populate pg_class and pg_attribute with composite types cockroachdb/cockroach#109675

I can still already integration test the runtime behaviour using PG generated classes, though.

[lukaseder]

Code generation will thus happen separately, once CRDB is ready:

• Add code generation support for CockroachDB 23 UDTs #15519

This issue will deal only with runtime support, for now.

[lukaseder]

This is now supported in jOOQ 3.19.