Comptime sparse_array codegen

[jp4g]

Description

Adds rust crate for generating sparse array

Problem*

Resolves noir-lang/noir#7213 - comptime generation of sparse array overflows stack

Summary*

Adds rust crate that generates a sparse_array string that can be used at comptime

Additional Context

Does not handle mut sparse array, figured that mutable sparse array and comptime generation were antithetical

PR Checklist*

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