proto: folder structure adhere to buf (#5025)

scripts/protocgen.sh

@@ -5,7 +5,8 @@ set -eo pipefail
 proto_dirs=$(find ./proto -path -prune -o -name '*.proto' -print0 | xargs -0 -n1 dirname | sort | uniq)
 for dir in $proto_dirs; do
   protoc \
-  -I. \
+  -I "proto" \
+  -I "third_party/proto" \
   --gogofaster_out=\
 Mgoogle/protobuf/timestamp.proto=github.com/gogo/protobuf/types,\
 Mgoogle/protobuf/duration.proto=github.com/golang/protobuf/ptypes/duration,\
@@ -13,8 +14,9 @@ plugins=grpc,paths=source_relative:. \
   $(find "${dir}" -maxdepth 1 -name '*.proto')
 done
 
-cp -r proto/abci/types.pb.go ./abci/types
-rm -rf proto/abci/types.pb.go
+cp -r ./tendermint/* ./proto/*
+rm -rf tendermint
 
-cp -r proto/rpc/types.pb.go ./rpc/grpc
-rm -rf proto/rpc/types.pb.go
+mv ./proto/tendermint/abci/abci.pb.go ./abci/types
+
+mv ./proto/tendermint/rpc/grpc/types.pb.go ./rpc/grpc