feat(pipeline): join processor

[shuiyisong]

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Refer to a related PR or issue link (optional)

What's changed and what's your intention?

Porting https://github.com/GreptimeTeam/pipeline/pull/44

Implement join processor

Checklist

• [ ] I have written the necessary rustdoc comments.
• [x] I have added the necessary unit tests and integration tests.
• [ ] This PR requires documentation updates.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 76.25000% with 19 lines in your changes missing coverage. Please review.

Project coverage is 84.62%. Comparing base (0fc18b6) to head (df7a9ea).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #4158 +/- ## ========================================== - Coverage 84.92% 84.62% -0.31% ========================================== Files 1023 1024 +1 Lines 179298 179378 +80 ========================================== - Hits 152272 151791 -481 - Misses 27026 27587 +561 ```