feat: deploy on skale testnet

[JhChoy]

• Deploy on skale Europa testnet

[github-actions]

Test with 08da2a1.

• EHET : Empty heap with empty segment tree
• EHDT : Empty heap with dirty segment tree
• FHET : Filled heap with empty segment tree
• FHFT : Filled heap with filled segment tree
  No longer impact gas costs

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (e450593) 87.71% compared to head (7523d45) 87.66%.
Report is 3 commits behind head on main.

Files	Patch %	Lines
contracts/OrderBook.sol	95.23%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #55      +/-   ##
==========================================
- Coverage   87.71%   87.66%   -0.06%     
==========================================
  Files          10       10              
  Lines         692      689       -3     
  Branches      146      146              
==========================================
- Hits          607      604       -3     
  Misses         80       80              
  Partials        5        5              

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