feat(connectors): extend Postgres sink & source connectors, add integration tests

[spetz]

• Extended Postgres sink/source connectors with JSON and raw message format support, multiple processing modes (mark/delete), and bytea column handling
• Added comprehensive integration tests for sink and source connectors
• Improved shared configuration loader with env overrides for array and strings
• Updated Rust dependencies, while locking reqwest and a few others until fully compatible with other crates
• Added optional verbose flag for sink and source configuration to toggle logging about processed messages

[hubcio]

besides that sink processes using batches but it inserts one row at a time, you can optimize, other than that looks good

[spetz]

besides that sink processes using batches but it inserts one row at a time, you can optimize, other than that looks good

Will fix, and also unify the configurations, to override what's necessary via existing env provider.