Move HTML backtest report out of the backtest to enable other type of reports.

[cinar]

Describe Request

Moved HTML backtest report out of the backtest to enable other type of reports.

Change Type

New feature.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 69.23077% with 52 lines in your changes missing coverage. Please review.

Project coverage is 92.68%. Comparing base (7076260) to head (d715d03).

Files with missing lines	Patch %	Lines
backtest/html_report.go	69.52%	18 Missing and 14 partials ⚠️
backtest/backtest.go	75.47%	7 Missing and 6 partials ⚠️
cmd/indicator-backtest/main.go	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #209      +/-   ##
==========================================
- Coverage   93.27%   92.68%   -0.60%     
==========================================
  Files         155      157       +2     
  Lines        4047     4089      +42     
==========================================
+ Hits         3775     3790      +15     
- Misses        224      240      +16     
- Partials       48       59      +11     

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