refactor(core): Reorg the building of openapi-related code

[zhanglei1949]

• Generate flex python code in-place rather copy from temporary directory.
• Update coordinator code.
• Python code format.
• Align coordinator' data type same with interactive. Fix Align Coordinator's DataType with Interactive's DataType. #4471 , Fix Introducing var_char in coordinator #4470
• Maintain long_text.py, date_type.py and time_stamp_type.py in our codebase, since the auto generated code fails at deserialization.

Note that although coordinator's flex-related code could also be generated when needed, but we still preserve them in the code base for reference.

[github-actions]

Please check the preview of the documentation changes at
https://dff1b814.graphscope-docs-preview.pages.dev

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.65%. Comparing base (7b8a4aa) to head (78c3587).
Report is 3 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #4481       +/-   ##
===========================================
+ Coverage   33.10%   62.65%   +29.54%     
===========================================
  Files         126      127        +1     
  Lines       13265    13291       +26     
===========================================
+ Hits         4392     8327     +3935     
+ Misses       8873     4964     -3909     

Files with missing lines	Coverage Δ
python/graphscope/analytical/udf/compile.py	91.29% <ø> (+66.39%)	⬆️
python/graphscope/analytical/udf/patch.py	100.00% <ø> (+97.36%)	⬆️
python/graphscope/client/connection.py	35.25% <ø> (ø)
python/graphscope/client/session.py	67.39% <ø> (+11.20%)	⬆️
python/graphscope/config.py	75.56% <ø> (+0.75%)	⬆️
python/graphscope/framework/dag.py	84.53% <ø> (+3.09%)	⬆️
python/graphscope/framework/operation.py	87.50% <ø> (+11.11%)	⬆️

... and 70 files with indirect coverage changes

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