[GraalVM] Include missing grpc configurations for Direct Path support
This was discovered during an offline discussion with @BenWhitehead on https://github.com/googleapis/java-storage/issues/2716 where Storage ran into a run-time failures in graalvm when adding Direct Path support.
The solution (in progress) has been to include reflection configurations for io.grpc classes (https://github.com/googleapis/java-storage/issues/2716).
In the future, we should consider hosting or generating these generic configurations in sdk-platform-java to avoid duplicating this effort for libraries considering adding direct path support in the future.
cc/ @burkedavison
The failures we ran into all appears to be for protobuf generated classes (messages, builders, enums). Rather than grpc classes themselves.