feature: add ExchangePublic

[zenixls2]

This is for exporting bbgo as a library when we want to use ExchangeMarketService + Minimal for a Exchange with only public api enabled (without api keys)

Right now if we pass in empty api key and passphrase, a public api only exchange instance will be created. We also need to reuse some of the utilities inside bbgo to avoid rebuilding the wheels.

[bbgokarma-bot]

Welcome back! @zenixls2, This pull request may get 221 BBG.

[zenixls2]

instead of using PublicExchange, we follow the naming convention of Exchange interfaces here to name this new interface as ExchangePublic (Exchange + adj)

[bbgokarma-bot]

Re-estimated karma: this pull request may get 502 BBG

[bbgokarma-bot]

Re-estimated karma: this pull request may get 505 BBG

[bbgokarma-bot]

Re-estimated karma: this pull request may get 520 BBG

[codecov]

Codecov Report

Attention: Patch coverage is 40.00000% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 22.40%. Comparing base (c5dbd4b) to head (8268ac1).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1575      +/-   ##
==========================================
+ Coverage   22.28%   22.40%   +0.12%     
==========================================
  Files         615      615              
  Lines       44416    44431      +15     
==========================================
+ Hits         9896     9956      +60     
+ Misses      33814    33763      -51     
- Partials      706      712       +6     

Files	Coverage Δ
pkg/types/exchange.go	52.00% <ø> (+52.00%)	⬆️
pkg/cache/cache.go	45.54% <33.33%> (ø)
pkg/exchange/binance/exchange.go	6.03% <41.66%> (+4.36%)	⬆️

... and 1 file with indirect coverage changes

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[bbgokarma-bot]

Re-estimated karma: this pull request may get 545 BBG

[bbgokarma-bot]

Re-estimated karma: this pull request may get 572 BBG

[bbgokarma-bot]

Re-estimated karma: this pull request may get 590 BBG

[bbgokarma-bot]

Hi @zenixls2,

Well done! 595 BBG has been sent to your polygon wallet. Please check the following tx:

https://polygonscan.com/tx/0xed1388f5d208f1ee9c7517f9b8a4dadd5dcbbd9c1395916d08b8b3dd6d4329af

Thank you for your contribution!