Replace protobuf crate with prost! (#1390)

* Replace protobuf crate with prost!

* Add copyright headers to build.rs files.

* kad: Fix error when mapping connection types.

Co-Authored-By: Pierre Krieger <pierre.krieger1708@gmail.com>

* Fix more mapping mistakes.

Co-authored-by: Pierre Krieger <pierre.krieger1708@gmail.com>

scripts/protobuf/Dockerfile

@@ -1,5 +0,0 @@
-FROM rust:1.38
-
-RUN apt-get update && apt-get install -y protobuf-compiler
-
-RUN cargo install --version 2.8.1 protobuf-codegen

scripts/protobuf/gen.sh

@@ -1,35 +0,0 @@
-#!/usr/bin/env bash
-# exit immediately when a command fails
-set -e
-# only exit with zero if all commands of the pipeline exit successfully
-set -o pipefail
-# error on unset variables
-set -u
-# print each command before executing it
-set -x
-
-
-# The source .proto file.
-SOURCE_PROTO_FILE=$1
-
-DEST_FOLDER=$(dirname "$SOURCE_PROTO_FILE")
-
-# The .rs file generated via protoc.
-TMP_GEN_RUST_FILE=${SOURCE_PROTO_FILE/proto/rs}
-
-# The above with `_proto` injected.
-FINAL_GEN_RUST_FILE=${TMP_GEN_RUST_FILE/.rs/_proto.rs}
-
-
-sudo docker build -t rust-libp2p-protobuf-builder $(dirname "$0")
-
-sudo docker run --rm \
-     -v `pwd`:/usr/code:z \
-     -u="$(id -u):$(id -g)" \
-     -w /usr/code \
-     rust-libp2p-protobuf-builder \
-     /bin/bash -c " \
-    protoc --rust_out $DEST_FOLDER $SOURCE_PROTO_FILE"
-
-
-mv $TMP_GEN_RUST_FILE $FINAL_GEN_RUST_FILE