Stochastic Oscillator Strategy added. Issue 340

[whencanibe]

Describe Request

Implements the Stochastic Oscillator Strategy as requested in issue #340.

The Stochastic Oscillator indicator already exists in the momentum package.
This PR adds the strategy layer on top of it, following the existing patterns in strategy/momentum.

Fixed #340

Change Type

New strategy.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.46%. Comparing base (26051b2) to head (d002c97).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #382      +/-   ##
==========================================
+ Coverage   93.27%   93.46%   +0.18%     
==========================================
  Files         222      223       +1     
  Lines        6382     6441      +59     
==========================================
+ Hits         5953     6020      +67     
+ Misses        348      340       -8     
  Partials       81       81              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.