feat: add priceBook() at CloberOrderBook.sol

[JhChoy]

• Added priceBook() at the interface too.

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +0.14 🎉

Comparison is base (1bcaf60) 87.57% compared to head (dbdb0d9) 87.71%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #53      +/-   ##
==========================================
+ Coverage   87.57%   87.71%   +0.14%     
==========================================
  Files          10       10              
  Lines         684      692       +8     
  Branches      146      146              
==========================================
+ Hits          599      607       +8     
  Misses         80       80              
  Partials        5        5              

see 5 files with indirect coverage changes

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