REFACTOR: [dca2] refactor dca2 strategy to make it can back testing

[kbearXD]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 22 lines in your changes are missing coverage. Please review.

Project coverage is 22.58%. Comparing base (b6e7c48) to head (e856727).
Report is 22 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1629   +/-   ##
=======================================
  Coverage   22.58%   22.58%           
=======================================
  Files         621      621           
  Lines       45010    44982   -28     
=======================================
- Hits        10164    10161    -3     
+ Misses      34112    34085   -27     
- Partials      734      736    +2     

Files	Coverage Δ
pkg/strategy/dca2/open_position.go	53.84% <ø> (+6.11%)	⬆️
pkg/strategy/dca2/state.go	0.00% <0.00%> (ø)
pkg/strategy/dca2/strategy.go	0.67% <0.00%> (-0.02%)	⬇️

... and 4 files with indirect coverage changes

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