feat: add compile sierra to casm util

crates/gateway/build.rs

@@ -0,0 +1,22 @@
+use std::process::Command;
+
+fn main() {
+    install_starknet_sierra_compile();
+}
+
+fn install_starknet_sierra_compile() {
+    let mut command = Command::new("cargo");
+    command.arg("install");
+    command.arg("--root");
+    command.arg("/home/arni/workspace/mempool/crates/gateway/src/compiler"); // TODO: DOn't dup the path.
+    command.arg("starknet-sierra-compile");
+    let result = command.output();
+    if let Err(e) = result {
+        panic!("Failed to execute command: {}", e);
+    }
+    let compile_output = result.unwrap(); // TODO: handle error
+    let stderr_output = String::from_utf8(compile_output.stderr).unwrap(); // TODO: handle error
+    if !compile_output.status.success() {
+        panic!("Failed to compile Sierra code: {}", stderr_output);
+    };
+}

crates/gateway/src/compiler.rs

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