Refactor EVM.BridgeRouter from interface to resource & impl

[sisyphusSmiling]

Closes: #60

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For contributor use:

• Targeted PR against main branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the standards mentioned here.
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.02%. Comparing base (428634e) to head (26b93b2).
Report is 94 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #61      +/-   ##
==========================================
+ Coverage   82.88%   86.02%   +3.13%     
==========================================
  Files          18       19       +1     
  Lines         818      887      +69     
==========================================
+ Hits          678      763      +85     
+ Misses        140      124      -16     

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