refactor: remove DfPlan wrapper

[waynexia]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

Closes #4384

What's changed and what's your intention?

Remove LogicalPlan wrapper. This is the last task of #3884

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 76.66667% with 14 lines in your changes missing coverage. Please review.

Project coverage is 84.62%. Comparing base (0295f8d) to head (f0ab8a7).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4733      +/-   ##
==========================================
- Coverage   84.88%   84.62%   -0.26%     
==========================================
  Files        1117     1117              
  Lines      201489   201471      -18     
==========================================
- Hits       171029   170503     -526     
- Misses      30460    30968     +508