feat(rpc): make v9 self contained

[thiagodeev]

Make RPC v9 self-contained, so that it no longer depends on code from v6 pkg.
Same as PR #3439, but for v9.

Note: this PR also removed the "github.com/crate-crypto/go-ipa/bandersnatch/fp" module from our code.
While I was copying the code to v9, I noticed there was this library being used only there, while the rest of the code uses the code from Consensys. This mod doesn't even have a stable release and has only a few stars on GitHub. So I decided to remove it.

[codecov]

Codecov Report

❌ Patch coverage is 86.85714% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.42%. Comparing base (b3eff73) to head (c21cd0b).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
rpc/v9/simulation.go	18.18%	9 Missing ⚠️
rpc/v9/sync.go	75.86%	6 Missing and 1 partial ⚠️
rpc/v9/events.go	66.66%	4 Missing ⚠️
rpc/v9/block.go	92.85%	2 Missing ⚠️
rpc/v9/state_update.go	94.11%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3450      +/-   ##
==========================================
- Coverage   75.48%   75.42%   -0.06%     
==========================================
  Files         384      386       +2     
  Lines       34805    34907     +102     
==========================================
+ Hits        26273    26330      +57     
- Misses       6689     6731      +42     
- Partials     1843     1846       +3     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[rodrodros]

Rebasing to run the new sdks over the PR

[rodrodros]

Valid linter failures before we can merge

[rodrodros]

Looks good, appreciate the organized commit history