[FR]: Support proto_library in other packages for ts_proto_library #752
Description
What is the current behavior?
Right now ts_proto_library only supports using depending on proto_library in the same package as it requires proto_srcs to be set, which takes file names as opposed to target names. This makes it impossible to include dependencies. See #627 for an example.
Describe the feature
ts_proto_library should be able to depend on protobuf messages and proto_library rules defined in other packages, and copy_files should copy them to the right place.