Feature request: Referencing the RLP decoding library in mapping.ts.

[LiRiu]

Is your feature request related to a problem? Please describe.
if an event contains dynamic types, zkgraph developers need to manually decode and personally calculate the offset and length for data parsing.

Describe the solution you'd like
Import the compilable rlp dependency library.

[nom4dv3]

good one. we'll consider this after stable