feat: sierra to casm compiler

Cargo.toml

@@ -26,3 +26,4 @@ serde_json = "1.0"
 starknet_api = "0.8.0"
 tokio = { version = "0.2", features = ["macros"] }
 thiserror = "1.0"
+rstest = "0.17.0"

crates/gateway/Cargo.toml

@@ -13,6 +13,7 @@ serde_json.workspace = true
 starknet_api.workspace = true
 tokio.workspace = true
 thiserror.workspace = true
+rstest.workspace = true
 
 [lints]
 workspace = true

crates/gateway/build.rs

@@ -0,0 +1,16 @@
+use std::process::Command;
+
+fn main() {
+    let output = Command::new("cargo")
+        .arg("install")
+        .arg("--root")
+        .arg("target")
+        .arg("starknet-sierra-compile")
+        .output()
+        .expect("Failed to install starknet-sierra-compile");
+
+    if !output.status.success() {
+        eprintln!("Cargo install failed: {:?}", output);
+        std::process::exit(1);
+    }
+}

crates/gateway/src/compiler.rs

@@ -0,0 +1 @@
+pub mod compile;