Add some Rust smoketesting CI for barretenberg_wrapper (noir-lang#14)

* Cargo format

* Clippy fixes

* Update tests to match tests in aztec_backend

* Add cargo config to set clang as linker when target is x86_64-unknown-linux-gnu

barretenberg_wrapper/.cargo/config.toml

@@ -4,6 +4,5 @@
 # https://doc.rust-lang.org/cargo/reference/config.html#hierarchical-structure
 [target.x86_64-unknown-linux-gnu]
 rustflags = ["-C", "linker=clang", "-C", "link-arg=-fuse-ld=lld"]
-
 [target.aarch64-unknown-linux-gnu]
 rustflags = ["-C", "linker=clang", "-C", "link-arg=-fuse-ld=lld"]