feat: Adding parsing of year,month,day files from plexos

[pesap]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 96.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 83.07%. Comparing base (b93efad) to head (799389a).

Files with missing lines	Patch %	Lines
src/r2x/exporter/sienna.py	96.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #175      +/-   ##
==========================================
+ Coverage   82.87%   83.07%   +0.20%     
==========================================
  Files          42       42              
  Lines        4431     4444      +13     
==========================================
+ Hits         3672     3692      +20     
+ Misses        759      752       -7     

Files with missing lines	Coverage Δ
src/r2x/parser/plexos_utils.py	64.41% <100.00%> (+0.81%)	⬆️
src/r2x/exporter/sienna.py	94.68% <96.00%> (+3.73%)	⬆️

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