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 :warning:
nebula3/gclient/net/Session.py	77.77%	2 Missing :warning:
nebula3/gclient/net/base.py	85.71%	2 Missing :warning:
nebula3/gclient/net/Connection.py	66.66%	1 Missing :warning:

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Additional details and impacted files

```diff @@ 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