Remove tonic dep from remote_attestation crate by natively including protos (#2559)

This makes sense conceptually, as the remote_attestation crate is not tied to a specific protocol, whereas tonic is

Author: Juliette Pretot

Cargo.lock

@@ -14,7 +14,6 @@ ring = "*"
 serde = { version = "*", features = ["derive"] }
 serde-big-array = { version = "*", features = ["const-generics"] }
 sha2 = "*"
-tonic = { version = "*", features = ["tls"] }
 
 [build-dependencies]
 prost-build = "*"

oak_functions/loader/fuzz/Cargo.lock

@@ -16,7 +16,7 @@
 
 pub mod proto {
     #![allow(clippy::return_self_not_must_use)]
-    tonic::include_proto!("oak.remote_attestation");
+    include!(concat!(env!("OUT_DIR"), "/oak.remote_attestation.rs"));
 }
 
 pub mod crypto;