Support `pgsql-kafka` binding

[jfallows]

Note: consider direct support of CREATE TABLE etc here instead of exposing the concept of topics.

Mappings

• [x] pgsql CREATE TOPIC command to KafkaCreateTopicsBeginEx plus catalog register new schema
• https://github.com/aklivity/zilla/pull/1245
• [ ] pgsql ALTER TOPIC command to KafkaAlterConfigsBeginEx plus catalog register new schema
• [ ] pgsql DELETE TOPIC command to KafkaDeleteTopicsBeginEx

Note: requires support for new Kafka...BeginEx, plus support for catalog register new schema.