chore: remove unnecessary EVM client interface

[rach-id]

Overview

Contributes to #108

Checklist

• New and updated code has appropriate documentation
• New and updated code has new and/or updated testing
• Required CI checks are passing
• Visual proof for any user facing features like CLI or documentation updates
• Linked issues closed with keywords

[codecov-commenter]

Codecov Report

Merging #109 (04a0fcc) into main (acd5c2f) will decrease coverage by 22.16%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main     #109       +/-   ##
===========================================
- Coverage   59.75%   37.60%   -22.16%     
===========================================
  Files           6        9        +3     
  Lines         164      359      +195     
===========================================
+ Hits           98      135       +37     
- Misses         53      209      +156     
- Partials       13       15        +2     

Impacted Files	Coverage Δ
evm/evm_client.go	0.00% <ø> (ø)
evm/evm_transaction_opts.go	23.80% <0.00%> (ø)
evm/ethereum_signature.go	90.00% <0.00%> (ø)

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