feat(source): create source with connection/drop connection

[WillyKidd]

I hereby agree to the terms of the RisingWave Labs, Inc. Contributor License Agreement.

What's changed and what's your intention?

• Moved Connection from root catalog to schema catalog
• Refined the Create Connection and Show Connections statements according to the changes
• Implemented the Drop Connection statement
• Added MockConnection connection type for testing
• Added some e2e tests for the above features

This is a followup of the last pr: #8907

Related: #8771, #9119

Checklist For Contributors

• I have written necessary rustdoc comments
• I have added necessary unit tests and integration tests
• I have added fuzzing tests or opened an issue to track them. (Optional, recommended for new SQL features Sqlsmith: Sql feature generation #7934).
• I have demonstrated that backward compatibility is not broken by breaking changes and created issues to track deprecated features to be removed in the future. (Please refer to the issue)
• All checks passed in ./risedev check (or alias, ./risedev c)

Checklist For Reviewers

• I have requested macro/micro-benchmarks as this PR can affect performance substantially, and the results are shown.

Documentation

• My PR DOES contain user-facing changes.

Types of user-facing changes

• SQL commands, functions, and operators

Release note

• Added support for CREATE SOURCE with a privatelink connection. Syntax:

  CREATE SOURCE tcp_metrics (
      device_id VARCHAR,
      metric_name VARCHAR,
      report_time TIMESTAMP,
      metric_value DOUBLE PRECISION
  ) WITH (
      connector = 'kafka',
      topic = 'tcp_metrics',
      scan.startup.mode = 'earliest',
      properties.bootstrap.server = 'b-1.test.ra68za.c10.kafka.us-east-1.amazonaws.com:9092,b-2.test.ra68za.c10.kafka.us-east-1.amazonaws.com:9092',
      connection.name = 'connection_name',
      privatelink.targets = '[{"port": 8001}, {"port": 8002}]',
  ) ROW FORMAT JSON;

• Added support for DROP CONNECTION. Syntax:

  DROP CONNECTION {{ name }};

[codecov]

Codecov Report

Merging #9128 (09f9f28) into main (0f37811) will decrease coverage by 0.06%.
The diff coverage is 6.56%.

@@            Coverage Diff             @@
##             main    #9128      +/-   ##
==========================================
- Coverage   70.89%   70.83%   -0.06%     
==========================================
  Files        1203     1201       -2     
  Lines      200839   200992     +153     
==========================================
- Hits       142377   142365      -12     
- Misses      58462    58627     +165     

Flag	Coverage Δ
rust	70.83% <6.56%> (-0.06%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/ctl/src/cmd_impl/meta/connection.rs	0.00% <0.00%> (ø)
src/ctl/src/lib.rs	0.72% <ø> (+0.06%)	⬆️
src/frontend/src/binder/relation/mod.rs	73.79% <ø> (+0.66%)	⬆️
src/frontend/src/catalog/catalog_service.rs	4.08% <0.00%> (-0.05%)	⬇️
src/frontend/src/catalog/root_catalog.rs	62.10% <0.00%> (-2.40%)	⬇️
src/frontend/src/handler/create_connection.rs	0.00% <0.00%> (ø)
src/frontend/src/handler/drop_connection.rs	0.00% <0.00%> (ø)
src/frontend/src/handler/mod.rs	55.00% <0.00%> (ø)
src/frontend/src/handler/show.rs	45.55% <0.00%> (-0.18%)	⬇️
src/frontend/src/observer/observer_manager.rs	0.00% <0.00%> (ø)
... and 16 more

... and 5 files with indirect coverage changes

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[StrikeW]

LGTM

[yezizp2012]

Rest LGTM.