chore: simplify how acvm_backend.wasm is embedded (#4703)

# Description

## Problem\*

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

## Summary\*

We only need a single file to be embedded into `bn254_blackbox_solver`
so we don't need the overhead of `rust_embed`. We can instead just
assign the bytes to a const variable.

I've also removed some build dependencies which are unnecessary.


## Additional Context



## Documentation\*

Check one:
- [ ] No documentation needed.
- [ ] Documentation included in this PR.
- [ ] **[For Experimental Features]** Documentation to be submitted in a
separate PR.

# PR Checklist\*

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

acvm-repo/bn254_blackbox_solver/Cargo.toml

@@ -19,15 +19,8 @@ thiserror.workspace = true
 num-traits.workspace = true
 cfg-if = "1.0.0"
 
-rust-embed = { version = "6.6.0", features = [
-    "debug-embed",
-    "interpolate-folder-path",
-    "include-exclude",
-] }
-
-grumpkin = { version = "0.1.0", package = "noir_grumpkin", features = [
-    "std",
-] } # BN254 fixed base scalar multiplication solver
+# BN254 fixed base scalar multiplication solver
+grumpkin = { version = "0.1.0", package = "noir_grumpkin", features = ["std"] } 
 ark-ec = { version = "^0.4.0", default-features = false }
 ark-ff = { version = "^0.4.0", default-features = false }
 num-bigint.workspace = true
@@ -45,15 +38,6 @@ js-sys.workspace = true
 getrandom.workspace = true
 wasmer = "4.2.6"
 
-[build-dependencies]
-pkg-config = "0.3"
-tar = "~0.4.15"
-flate2 = "~1.0.1"
-reqwest = { version = "0.11.20", default-features = false, features = [
-    "rustls-tls",
-    "blocking",
-] }
-
 [features]
 default = ["bn254"]
 bn254 = ["acir/bn254"]

acvm-repo/bn254_blackbox_solver/src/wasm/mod.rs

@@ -76,10 +76,7 @@ use wasmer::{
 pub(super) const WASM_SCRATCH_BYTES: usize = 1024;
 
 /// Embed the Barretenberg WASM file
-#[derive(rust_embed::RustEmbed)]
-#[folder = "$BARRETENBERG_BIN_DIR"]
-#[include = "acvm_backend.wasm"]
-struct Wasm;
+const WASM_BIN: &[u8] = include_bytes!("./acvm_backend.wasm");
 
 impl Barretenberg {
     #[cfg(not(target_arch = "wasm32"))]
@@ -287,7 +284,7 @@ fn instance_load() -> (Instance, Memory, Store) {
 
     let (memory, mut store, custom_imports) = init_memory_and_state();
 
-    let module = Module::new(&store, Wasm::get("acvm_backend.wasm").unwrap().data).unwrap();
+    let module = Module::new(&store, WASM_BIN).unwrap();
 
     (Instance::new(&mut store, &module, &custom_imports).unwrap(), memory, store)
 }
@@ -299,17 +296,15 @@ async fn instance_load() -> (Instance, Memory, Store) {
 
     let (memory, mut store, custom_imports) = init_memory_and_state();
 
-    let wasm_binary = Wasm::get("acvm_backend.wasm").unwrap().data;
-
-    let js_bytes = unsafe { js_sys::Uint8Array::view(&wasm_binary) };
+    let js_bytes = unsafe { js_sys::Uint8Array::view(&WASM_BIN) };
     let js_module_promise = WebAssembly::compile(&js_bytes);
     let js_module: js_sys::WebAssembly::Module =
         wasm_bindgen_futures::JsFuture::from(js_module_promise).await.unwrap().into();
 
     let js_instance_promise =
         WebAssembly::instantiate_module(&js_module, &custom_imports.as_jsvalue(&store).into());
     let js_instance = wasm_bindgen_futures::JsFuture::from(js_instance_promise).await.unwrap();
-    let module: wasmer::Module = (js_module, wasm_binary).into();
+    let module = wasmer::Module::from((js_module, WASM_BIN));
     let instance: wasmer::Instance = Instance::from_jsvalue(&mut store, &module, &js_instance)
         .map_err(|_| "Error while creating BlackBox Functions vendor instance")
         .unwrap();