feat(connectors): Clickhouse Sink Connector

[kriti-sc]

Which issue does this PR close?

Closes #2539

Rationale

Clickhouse is a real-time data analytics engine, and very popular in modern analytics architectures.

What changed?

This PR introduces a Clickhouse Sink Connector that enables writing data from Iggy to Clickhouse.

The Clickhouse writing logic is heavily inspired by the official Clickhouse Kafka Connector.

Local Execution

• Produced messages 30456 + 29060 rows with schema user_id: String, user_type: u8, email: String, source: String, state: String, created_at: DateTime, message: String using sample data producer.
• Consumed messages using the Clickhouse sink and into the particular Clickhouse table.
• Verified schema and number of rows in Clickhouse.
• Added unit tests and e2e tests, both passing.

Images 1&2: Produced 30456 + 29060 rows into Iggy in two batches
Image 3: Verified schema and number of rows in Clickhouse

AI Usage

1. Which tools? (e.g., GitHub Copilot, Claude, ChatGPT) Claude Code
2. Scope of usage? (e.g., autocomplete, generated functions, entire implementation) generated functions
3. How did you verify the generated code works correctly? Manual testing by producing data into Iggy and then running the sink and verifying insertion into Clickhouse, unit tests and e2e tests for different Clickhouse insert configurations.
4. Can you explain every line of the code if asked? Yes

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.40%. Comparing base (8678ead) to head (11c2f47).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2886      +/-   ##
============================================
- Coverage     74.57%   74.40%   -0.17%     
  Complexity      937      937              
============================================
  Files          1249     1245       -4     
  Lines        123564   121340    -2224     
  Branches      99837    97645    -2192     
============================================
- Hits          92143    90280    -1863     
+ Misses        28438    28079     -359     
+ Partials       2983     2981       -2     

Components	Coverage Δ
Rust Core	75.55% <ø> (-0.18%)	⬇️
Java SDK	58.57% <ø> (ø)
C# SDK	69.41% <ø> (-0.45%)	⬇️
Python SDK	81.06% <ø> (ø)
PHP SDK	83.57% <ø> (ø)
Node SDK	91.35% <ø> (+0.12%)	⬆️
Go SDK	40.25% <ø> (ø)
see 59 files with indirect coverage changes

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[github-actions]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed in 7 days if no further activity occurs.

If you need a review, please ensure CI is green and the PR is rebased on the latest master. Don't hesitate to ping the maintainers - either @core on Discord or by mentioning them directly here on the PR.

Thank you for your contribution!

[hubcio]

overall good direction, just needs a little bit polishing

[github-actions]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed in 7 days if no further activity occurs.

If you need a review, please ensure CI is green and the PR is rebased on the latest master. Don't hesitate to ping the maintainers - either @core on Discord or by mentioning them directly here on the PR.

Thank you for your contribution!

[github-actions]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed in 7 days if no further activity occurs.

If you need a review, please ensure CI is green and the PR is rebased on the latest master. Don't hesitate to ping the maintainers - either @core on Discord or by mentioning them directly here on the PR.

Thank you for your contribution!

[kriti-sc]

/ready