Rename proto Req/Res to Pagination (#6796)

* Rename proto Req to Pagination

* Change Res to Pagination

Co-authored-by: Alexander Bezobchuk <alexanderbez@users.noreply.github.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

scripts/protocgen.sh

@@ -14,7 +14,7 @@ done
 
 # generate codec/testdata proto code
 protoc -I "proto" -I "third_party/proto" -I "testutil/testdata" --gocosmos_out=plugins=interfacetype+grpc,\
-Mgoogle/protobuf/any.proto=github.com/cosmos/cosmos-sdk/codec/types:. ./codec/testdata/proto.proto
+Mgoogle/protobuf/any.proto=github.com/cosmos/cosmos-sdk/codec/types:. ./testutil/testdata/proto.proto
 
 # move proto files to the right places
 cp -r github.com/cosmos/cosmos-sdk/* ./