feat(client): simplify client

[mask-pp]

No description provided.

[codecov]

Codecov Report

Attention: 22 lines in your changes are missing coverage. Please review.

Comparison is base (46779ca) 56.24% compared to head (a115600) 56.02%.

Files	Patch %	Lines
pkg/rpc/client.go	54.54%	5 Missing and 5 partials ⚠️
pkg/rpc/engine.go	50.00%	4 Missing and 2 partials ⚠️
pkg/rpc/ethclient.go	95.34%	1 Missing and 1 partial ⚠️
pkg/rpc/utils.go	50.00%	2 Missing ⚠️
pkg/rpc/methods.go	75.00%	1 Missing ⚠️
prover/proof_submitter/proof_contester.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #521      +/-   ##
==========================================
- Coverage   56.24%   56.02%   -0.22%     
==========================================
  Files          44       44              
  Lines        5576     5526      -50     
==========================================
- Hits         3136     3096      -40     
+ Misses       2117     2109       -8     
+ Partials      323      321       -2     

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