Add strategies

[lsbardel]

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 97.72727% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.09%. Comparing base (25e83c6) to head (cd0f5b8).

Files with missing lines	Patch %	Lines
quantflow/options/strategies/calendar_spread.py	90.90%	2 Missing ⚠️
quantflow/options/strategies/strangle.py	93.75%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #41      +/-   ##
==========================================
+ Coverage   81.22%   82.09%   +0.87%     
==========================================
  Files          45       52       +7     
  Lines        2711     2843     +132     
==========================================
+ Hits         2202     2334     +132     
  Misses        509      509              

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