Add PickledFunction.build_executor

[superstar54]

Fix #269 .

Add a classmethod build_executor for class PickledFunction so that the decorator does not need to load AiiDA profile.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 90.90909% with 1 line in your changes missing coverage. Please review.

Project coverage is 79.74%. Comparing base (5937b88) to head (9ed7f6b).
Report is 49 commits behind head on main.

Files	Patch %	Lines
aiida_workgraph/orm/function_data.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #270      +/-   ##
==========================================
+ Coverage   75.75%   79.74%   +3.98%     
==========================================
  Files          70       65       -5     
  Lines        4615     4897     +282     
==========================================
+ Hits         3496     3905     +409     
+ Misses       1119      992     -127     

Flag	Coverage Δ
python-3.11	79.66% <90.90%> (+3.99%)	⬆️
python-3.12	79.64% <90.90%> (?)
python-3.9	79.67% <90.90%> (+3.94%)	⬆️

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