feat!: vector optimizations

[zac-williamson]

Description

Big speedup for variable-length encoding and decoding
Solves #26

Problem*

variable-length encoding/decoding is needed to process jwts

Summary*

interface refactor to make encoding/decoding pure functions
more delicate handling of variable-length edge cases by using lookup tables as state machines instead of using branching logic

Additional Context

PR Checklist*

• I have tested the changes locally.
• I have formatted the changes with Prettier and/or cargo fmt on default settings.

[TomAFrench]

This is committing a lot of files which should be added to the .gitignore

[saleel]

This is committing a lot of files which should be added to the .gitignore

Yea, just removed them

@TomAFrench This PR is using BoundedVec::from_parts_unchecked which came only in 1.0.0.beta1 iirc. Is it required to have all releases of this lib work from Noir 0.36.0 onwards?

Is it ok to change this value?

[kashbrti]

@TomAFrench I think this just needs your approval to be merged in now. also added the benchmarking workflow, it's currently failing because it can't find the artefact on the main branch (because it's just being added I think).