Implement Money Flow Index

[tsubus]

https://www.investopedia.com/terms/m/mfi.asp

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.38%. Comparing base (a2f4ef8) to head (9ba295a).
Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #36      +/-   ##
==========================================
+ Coverage   98.32%   98.38%   +0.06%     
==========================================
  Files          41       42       +1     
  Lines         598      621      +23     
==========================================
+ Hits          588      611      +23     
  Misses          7        7              
  Partials        3        3              

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