Implement faster parser for the Faithful IPLD objects

[linuskendall]

Currently we are using IPLD Unmarshal:

yellowstone-faithful/iplddecoders/decoders.go

Line 67 in 2d89056

_, err := ipld.Unmarshal(epochRaw, dagcbor.Decode, &epoch, ipldbindcode.Prototypes.Epoch.Type())

This seems to be slow because it uses reflections and other tools to support the decoding.

In our case we could implement a faster decoder by skipping this step and instead implementing faster decoding inside the Faithful software.

• Benchmark the current IPLD decode
• Implement a new decoder for the faithful IPLD schema / objects
• Benchmark the new decoder
• Implement proper testing for the decoder (unit tests)

We have already something similar in Rust:

yellowstone-faithful/geyser-plugin-runner/src/epoch.rs

Line 27 in 2d89056

pub fn from_cbor(val: serde_cbor::Value) -> Result<Epoch, Box<dyn Error>> {

This could be rewritten in golang and integrated with Faithful.

[linuskendall]

Implemented .