bazel: Use new ProtoInfo provider
bazel: Use new ProtoInfo provider

The old `.proto` provider will be removed in a future Bazel release:
https://github.com/bazelbuild/bazel/issues/7152

The Bazel build now requires Bazel 0.22.0 or newer.

improbable-io/grpc-gateway,improbable-io/grpc-gateway,gengo/grpc-gateway,gengo/grpc-gateway,grpc-ecosystem/grpc-gateway