refactor!: remove opentsdb tcp server

[shuiyisong]

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?

This pr mainly removes the OpenTSDB TCP server, for

1. it's the only protocol on raw TCP layer, which brings a lot of feature implementation differences and difficulties compared to other server.
2. we suspect that not many users use the TCP protocol for ingesting OpenTSDB data. Users can still use the HTTP endpoint for OpenTSDB data ingestion.

We have not yet reached a final agreement. Please leave comments below if you have opposite opinion.

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR does not require documentation updates.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.29%. Comparing base (f29aebf) to head (f3e6012).
Report is 28 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3828      +/-   ##
==========================================
- Coverage   85.77%   85.29%   -0.48%     
==========================================
  Files         952      952              
  Lines      162629   162931     +302     
==========================================
- Hits       139492   138979     -513     
- Misses      23137    23952     +815     

[fengjiachun]

LGTM

[tisonkun]

Do we have some docs to update after this PR merged?

[shuiyisong]

Do we have some docs to update after this PR merged?

Yes, I'll check the doc once this pr is merged.

[tisonkun]

We have not yet reached a final agreement. Please leave comments below if you have opposite opinion.

I just saw this. Sorry. Let's move to draft to prevent unexpected merge.

[shuiyisong]

Now the opentsdb_addr is removed from start command in both frontend and standalone. Related configs and docs are modified. PTAL @tisonkun