Migrate RLP Library to new Cairo

[Eikix]

In Kakarot, the EOA smart account uses RLP encoding

Tasks

Beta Give feedback

1. Check if feat: investigate if we can use Herodotus' implementation of RLP in Cairo1 for SSJ #159 is suitable for RLP encoding, if so, import kkrt-labs/cairo-lib RLP it as a library and close this issue
2. If above point is not working, manually migrate RLP (rewrite) and place it in RLP crate in kakarot-ssj
3. Implement RLP decoding
4. Test RLP decoding and add EF tests for RLP decoding
5. Make sure RLP is well tested (migrate cairo zero former tests) and add more if need be (all RLP cases: short and long string, lists, etc.)

[danilowhk]

Can take this issue

[Eikix]

I think @LucasLvy started but won't have time to finish.
Basically his findings is that RLP from Herodotus is good enough, next task would be to:

• Import RLP from kkrt-labs/cairo-lib fork into kakarot-ssj
• Migrate RLP tests from Kakarot cairo 0
• Make sure they pass using the RLP from cairo-lib. If it doesn't pass, then alert team and create new issues to either -> fix cairo-lib RLP package, or migrate our own.

[Eikix]

Can take this issue

Assigned you!

[Eikix]

Important update: we are gathering some bugs in the Kakarot v0 codebase, we need to make sure each issue and each PR in Kakarot-ssj is aware of the lists of known bugs. Look at this tracking issue everytime you take an issue and check your issue isn't targeted by a known bug. Will add this reminder in many places to make sure we keep track of known bugs.

[Eikix]

@Quentash this is the issue you're doing now and opened a PR for #405

[Quentash]

Alright !