feat: add decolorize processor

[waynexia]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

What's changed and what's your intention?

Implement the decolorize processor similar to the one from Loki https://grafana.com/docs/loki/latest/query/log_queries/#removing-color-codes

Also remove some dead code BTW

Checklist

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

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Copilot reviewed 5 out of 5 changed files in this pull request and generated no suggestions.

[paomian]

Can we add some tests that generate pipelines from yaml and verify that they are correct？like test in src/pipeline/tests/pipeline.rs And it can be used as an example to show others how to use it.

[codecov]

Codecov Report

Attention: Patch coverage is 78.21782% with 22 lines in your changes missing coverage. Please review.

Project coverage is 83.79%. Comparing base (a6571d3) to head (bcd084f).
Report is 12 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5065      +/-   ##
==========================================
- Coverage   83.93%   83.79%   -0.15%     
==========================================
  Files        1155     1157       +2     
  Lines      216105   216427     +322     
==========================================
- Hits       181386   181347      -39     
- Misses      34719    35080     +361     

[waynexia]

Can we add some tests that generate pipelines from yaml and verify that they are correct？like test in src/pipeline/tests/pipeline.rs And it can be used as an example to show others how to use it.

add one in bcd084f

[shuiyisong]

LGTM