fix(fulltext-index): single segment is not sufficient for >50M rows SST

[zhongzc]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

When building the fulltext index, an oversized SST was encountered, which exceeded a single segment buffer, causing the index building to fail.

What's changed and what's your intention?

Use IndexWriter to build the index to allow multiple segments for one SST.

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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[codecov]

Codecov Report

Attention: Patch coverage is 83.09859% with 12 lines in your changes missing coverage. Please review.

Project coverage is 84.61%. Comparing base (ec59ce5) to head (ece4c90).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4552      +/-   ##
==========================================
- Coverage   84.88%   84.61%   -0.28%     
==========================================
  Files        1094     1094              
  Lines      196306   196364      +58     
==========================================
- Hits       166639   166150     -489     
- Misses      29667    30214     +547