fix(build): Allow creating multiple services in the same package (#173)

BREAKING CHANGE: Build will now generate each service client and server into their own modules.

tonic-build/src/lib.rs

@@ -251,13 +251,7 @@ impl prost_build::ServiceGenerator for ServiceGenerator {
             let clients = &self.clients;
 
             let client_service = quote::quote! {
-                /// Generated client implementations.
-                pub mod client {
-                    #![allow(unused_variables, dead_code, missing_docs)]
-                    use tonic::codegen::*;
-
-                    #clients
-                }
+                #clients
             };
 
             let code = format!("{}", client_service);
@@ -270,13 +264,7 @@ impl prost_build::ServiceGenerator for ServiceGenerator {
             let servers = &self.servers;
 
             let server_service = quote::quote! {
-                /// Generated server implementations.
-                pub mod server {
-                    #![allow(unused_variables, dead_code, missing_docs)]
-                    use tonic::codegen::*;
-
-                    #servers
-                }
+                #servers
             };
 
             let code = format!("{}", server_service);