refactor(rpc): make v8 self contained

[thiagodeev]

Make RPC v8 self-contained, so that it no longer depends on code from v6 pkg.

[codecov]

Codecov Report

❌ Patch coverage is 88.12155% with 43 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.72%. Comparing base (56989f1) to head (c93fbc0).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
rpc/v8/block.go	77.77%	14 Missing ⚠️
rpc/v8/simulation.go	18.18%	9 Missing ⚠️
rpc/v8/events.go	85.71%	4 Missing and 4 partials ⚠️
rpc/v8/sync.go	75.86%	6 Missing and 1 partial ⚠️
rpc/v8/class.go	92.59%	3 Missing and 1 partial ⚠️
rpc/v8/state_update.go	98.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3547      +/-   ##
==========================================
+ Coverage   75.62%   75.72%   +0.09%     
==========================================
  Files         397      401       +4     
  Lines       35389    35692     +303     
==========================================
+ Hits        26762    27026     +264     
- Misses       6763     6798      +35     
- Partials     1864     1868       +4     

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