Add fiscal data

[lsbardel]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 37.14286% with 22 lines in your changes missing coverage. Please review.

Project coverage is 67.52%. Comparing base (7a378c7) to head (806754c).

Files with missing lines	Patch %	Lines
quantflow/data/fiscal_data.py	41.37%	17 Missing ⚠️
quantflow/utils/dates.py	16.66%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #28      +/-   ##
==========================================
- Coverage   67.93%   67.52%   -0.41%     
==========================================
  Files          42       43       +1     
  Lines        2601     2636      +35     
==========================================
+ Hits         1767     1780      +13     
- Misses        834      856      +22     

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