chore!: remove circuit methods from noir_wasm (#3869)

# Description

## Problem\*

Resolves <!-- Link to GitHub Issue -->

## Summary\*

This PR removes the unused `circuit` module from `noir_wasm`. We never
need to use these methods as all they do is convert between the
canonical circuit serialisation format and a huge serde-ed json
representation.

## Additional Context



## Documentation\*

Check one:
- [x] No documentation needed.
- [ ] Documentation included in this PR.
- [ ] **[Exceptional Case]** Documentation to be submitted in a separate
PR.

# PR Checklist\*

- [x] I have tested the changes locally.
- [x] I have formatted the changes with [Prettier](https://prettier.io/)
and/or `cargo fmt` on default settings.

compiler/wasm/src/lib.rs

@@ -12,12 +12,10 @@ use serde::{Deserialize, Serialize};
 use std::str::FromStr;
 use wasm_bindgen::prelude::*;
 
-mod circuit;
 mod compile;
 mod compile_new;
 mod errors;
 
-pub use circuit::{acir_read_bytes, acir_write_bytes};
 pub use compile::compile;
 
 // Expose the new Context-Centric API