Initial (g)RPC implementation

asynchronix/build.rs

@@ -0,0 +1,17 @@
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    #[cfg(feature = "rpc-codegen")]
+    let builder = tonic_build::configure()
+        .build_client(false)
+        .out_dir("src/rpc/codegen/");
+
+    #[cfg(all(feature = "rpc-codegen", not(feature = "grpc-server")))]
+    let builder = builder.build_server(false);
+
+    #[cfg(feature = "rpc-codegen")]
+    builder.compile(
+        &["simulation.proto", "custom_transport.proto"],
+        &["src/rpc/api/"],
+    )?;
+
+    Ok(())
+}