Feature: use business day freq

[emhbrine]

• We should always be using business date frequencies B, W-FRI, BM, BQ, BA, instead of D, W, M, Q, A.
• Methods will continue to expect D, W, M, Q, or A as arguments but they'll be mapped to their business date counterpart.

[codecov]

Codecov Report

Merging #1238 (0560e3a) into develop (129f7dc) will increase coverage by 0.00%.
Report is 1 commits behind head on develop.
The diff coverage is 94.73%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1238   +/-   ##
========================================
  Coverage    76.44%   76.44%           
========================================
  Files           60       61    +1     
  Lines         5370     5362    -8     
========================================
- Hits          4105     4099    -6     
+ Misses        1265     1263    -2     

Files	Coverage Δ
macrosynergy/management/constants.py	100.00% <100.00%> (ø)
macrosynergy/management/utils/__init__.py	100.00% <ø> (ø)
macrosynergy/management/utils/df_utils.py	95.23% <100.00%> (+0.04%)	⬆️
macrosynergy/panel/category_relations.py	41.15% <ø> (ø)
macrosynergy/panel/make_zn_scores.py	93.93% <100.00%> (+1.55%)	⬆️
macrosynergy/panel/return_beta.py	89.31% <100.00%> (-0.40%)	⬇️
macrosynergy/visuals/correlation.py	83.60% <100.00%> (-0.14%)	⬇️
macrosynergy/panel/historic_vol.py	96.80% <0.00%> (ø)