Feature: Refactoring historic_vol()

[Magnus167]

This pull request adds date utility functions to the df_utils module and refactors the code to use the get_eops function for trigger indices calculation. It also adds the get_eops function to test_utils.py and refactors the get_cycles function in test_historic_vol.py. These changes improve the efficiency and readability of the codebase.

[codecov]

Codecov Report

Merging #1247 (744a07d) into develop (ab1219f) will decrease coverage by 0.01%.
Report is 1 commits behind head on develop.
The diff coverage is 84.61%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1247      +/-   ##
===========================================
- Coverage    76.44%   76.43%   -0.01%     
===========================================
  Files           61       61              
  Lines         5362     5382      +20     
===========================================
+ Hits          4099     4114      +15     
- Misses        1263     1268       +5     

Files	Coverage Δ
macrosynergy/management/utils/__init__.py	100.00% <ø> (ø)
macrosynergy/panel/historic_vol.py	97.40% <86.66%> (+0.59%)	⬆️
macrosynergy/management/utils/df_utils.py	93.95% <83.78%> (-1.29%)	⬇️