Add traceback in serializer

[superstar54]

• Add PyFunction process and @pyfunction decorator for running pure Python functions locally within AiiDA.
• Automatically serializes inputs and deserializes outputs, enabling use of native Python types.

Here is an example:

from aiida.engine import run_get_node
from aiida_pythonjob.decorator import pyfunction
from aiida import load_profile
from ase.build import bulk

load_profile()

@pyfunction(outputs=[{"name": "supercell"}, {"name": "original"}])
def make_supercell(atoms, dims=[2, 2, 2]):
    return {"supercell": atoms*dims, "original": atoms}

atoms = bulk('Si')
result, node = run_get_node(make_supercell, atoms=atoms, dims=[2, 2, 2])
print("result: ", result)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 77.22008% with 59 lines in your changes missing coverage. Please review.

Project coverage is 85.32%. Comparing base (71a2315) to head (5c503dc).

Files with missing lines	Patch %	Lines
src/aiida_pythonjob/calculations/pyfunction.py	76.66%	35 Missing ⚠️
src/aiida_pythonjob/decorator.py	81.25%	12 Missing ⚠️
src/aiida_pythonjob/launch.py	75.00%	9 Missing ⚠️
src/aiida_pythonjob/data/serializer.py	62.50%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #20      +/-   ##
==========================================
- Coverage   88.04%   85.32%   -2.73%     
==========================================
  Files          14       16       +2     
  Lines         661      913     +252     
==========================================
+ Hits          582      779     +197     
- Misses         79      134      +55     

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