Remove support of serde

This commit remove the use of protoc-prost-serde, and the support of
serde is deleted. Since serde and json is not necessary, this commit
is considered reasonable.

codegen/compile_protos.sh

@@ -70,7 +70,6 @@ $PROTOC $PROTOS $PROTOFLAGS \
     --prost_out="$BUILD_DIR/rust_out/src" \
     --prost_opt=compile_well_known_types \
     --prost_opt=extern_path=.google.protobuf=::pbjson_types \
-    --prost-serde_out="$BUILD_DIR/rust_out/src" \
     --tonic_out="$BUILD_DIR/rust_out/src" \
     --tonic_opt=compile_well_known_types \
     --tonic_opt=extern_path=.google.protobuf=::pbjson_types \

rust/src/google.rpc.rs

@@ -223,5 +223,4 @@ impl Code {
         }
     }
 }
-include!("google.rpc.serde.rs");
 // @@protoc_insertion_point(module)

rust/src/p4.config.v1.rs

@@ -1228,5 +1228,4 @@ pub struct Digest {
     #[prost(message, optional, tag="2")]
     pub type_spec: ::core::option::Option<P4DataTypeSpec>,
 }
-include!("p4.config.v1.serde.rs");
 // @@protoc_insertion_point(module)