Keltner Channel Strategy added. Issue 339

[whencanibe]

Describe Request

Implements the Keltner Channel Strategy as requested in issue #339.

The Keltner Channel indicator already exists in the volatility package. This PR adds the strategy layer on top of it, following the existing patterns in strategy/volatility.

Fixed #339

Change Type

New strategy.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 97.72727% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 93.24%. Comparing base (894947f) to head (40a381a).

Files with missing lines	Patch %	Lines
strategy/volatility/volatility.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #362      +/-   ##
==========================================
+ Coverage   93.21%   93.24%   +0.03%     
==========================================
  Files         219      220       +1     
  Lines        6311     6355      +44     
==========================================
+ Hits         5883     5926      +43     
- Misses        347      348       +1     
  Partials       81       81              

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[cinar]

Thank you very much for your contribution. If you can sign your commit, I will be able to merge it. Otherwise the repo policy is not allowing me to do so. Otherwise, your changes are all good.

[whencanibe]

Hi, Thank you for reviewing my PR.
I have signed the commit with my GPG key. Could you please take another look? Thank you!

[cinar]

Thank you very much!