Add grpc reflections

Signed-off-by: Nikolai Rodionov <allanger@badhouseplants.net>

lib/build.rs

@@ -1,4 +1,4 @@
-use std::io::Result;
+use std::{env, io::Result, path::PathBuf};
 
 fn main() -> Result<()> {
     //let proto_dir = "proto";
@@ -6,7 +6,11 @@ fn main() -> Result<()> {
     //for path in paths {
     //    prost_build::compile_protos(&[path.unwrap().path()], &[proto_dir])?;
     //}
-    tonic_prost_build::compile_protos("proto/audio_backend.proto")
+    //
+    let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
+    tonic_prost_build::configure()
+        .file_descriptor_set_path(out_dir.join("audio_backend_descriptor.bin"))
+        .compile_protos(&["proto/audio_backend.proto"], &["proto"])
         .unwrap_or_else(|e| panic!("Failed to compile protos {:?}", e));
 
     Ok(())