WIP: FEATURE: implement stats tracker

[c9s]

• rename Add() to AddProfit() or AddTrade() so that we can apply interface here

[bbgokarma-bot]

Welcome back! @c9s, This pull request may get 344 BBG.

[codecov]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (3dca9aa) 21.28% compared to head (4a3b0bc) 21.28%.
Report is 110 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1296   +/-   ##
=======================================
  Coverage   21.28%   21.28%           
=======================================
  Files         596      596           
  Lines       43933    43933           
=======================================
  Hits         9349     9349           
  Misses      33907    33907           
  Partials      677      677           

Files	Coverage Δ
pkg/strategy/xmaker/strategy.go	2.64% <0.00%> (ø)
pkg/types/profit.go	0.00% <0.00%> (ø)
pkg/types/trade_stats.go	19.10% <0.00%> (ø)
pkg/bbgo/order_executor_general.go	16.08% <0.00%> (ø)
pkg/strategy/drift/strategy.go	3.39% <0.00%> (ø)

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[bbgokarma-bot]

Re-estimated karma: this pull request may get 343 BBG

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