Add a base class for functions execute_*

[BeautyyuYanli]

In this PR,

• Add a base class named BaseExecutor, to be inherited by Session and Session Pool, which have the same functions execute_*
• fix typing ;
• pdm run fmt ;

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 81.63265% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 75.63%. Comparing base (6895832) to head (bb218fa).
Report is 3 commits behind head on master.

Files	Patch %	Lines
nebula3/gclient/net/ConnectionPool.py	75.00%	4 Missing ⚠️
nebula3/gclient/net/Session.py	77.77%	2 Missing ⚠️
nebula3/gclient/net/base.py	85.71%	2 Missing ⚠️
nebula3/gclient/net/Connection.py	66.66%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #338      +/-   ##
==========================================
- Coverage   76.88%   75.63%   -1.26%     
==========================================
  Files          18       19       +1     
  Lines        2514     2647     +133     
==========================================
+ Hits         1933     2002      +69     
- Misses        581      645      +64     

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[wey-gu]

Thanks!!!! This'll fix pain in our ass of pylance/pyright typing warnings on downstream projects(Yes GenAI Suite!).

LGTM, but on the safe side, due to ci dependency on nebula-ent side(master branch T__T), I'll manually verify build with this branch and come back afterward :-D