Add typehints in phelel_yaml.py

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Codecov Report

❌ Patch coverage is 80.00000% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.20%. Comparing base (4f2ebe0) to head (e39a2a1).
⚠️ Report is 94 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/phelel/interface/phelel_yaml.py	80.00%	8 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #130      +/-   ##
===========================================
+ Coverage    72.07%   73.20%   +1.13%     
===========================================
  Files           81       81              
  Lines         5791     6032     +241     
===========================================
+ Hits          4174     4416     +242     
+ Misses        1617     1616       -1     

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