PyFunction supports async function

[superstar54]

• Async user function -> schedule via Waiting (interruptable)
• Sync user function -> execute now, parse outputs, and finish

This feature needs aiida-core>=2.7.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 90.43478% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.37%. Comparing base (cbaff61) to head (4103b61).

Files with missing lines	Patch %	Lines
src/aiida_pythonjob/calculations/tasks.py	86.58%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #51      +/-   ##
==========================================
+ Coverage   87.01%   88.37%   +1.36%     
==========================================
  Files          21       22       +1     
  Lines        1101     1213     +112     
==========================================
+ Hits          958     1072     +114     
+ Misses        143      141       -2     

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