Coppock Curve Strategy added. Issue 344

[whencanibe]

Describe Request

Implements the Coppock Curve Strategy as requested in issue #344.
The Coppock Curve indicator already exists in the momentum package. This PR adds the strategy layer on top of it.

Fixed #344

Change Type

New strategy.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 96.96970% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 91.91%. Comparing base (607513d) to head (144fd8f).

Files with missing lines	Patch %	Lines
strategy/momentum/coppock_curve_strategy.go	96.87%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #388      +/-   ##
==========================================
+ Coverage   91.86%   91.91%   +0.05%     
==========================================
  Files         227      228       +1     
  Lines        7177     7210      +33     
==========================================
+ Hits         6593     6627      +34     
+ Misses        494      493       -1     
  Partials       90       90              

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