Fail to generate a proto with "routing" annotation

[summer-ji-eng]

Nodejs-bigtable fails on recently generating process. issue

Can't compile the generated code with a proto with new introduced google.api.routing annotation. proto

Generator is able to generate surface client library, but the generated client library fails on compiling.
Because to access the proto message property it require camelcase word than snakecase.

To reproduce the error, under the generator repo:

$ bazel build //...
$ bazel run //:gapic_generator_typescript --      --iam-service     --output-dir /tmp/bigtable2     -I "$GOOGLEAPIS"     --grpc-service-config "$GOOGLEAPIS/google/$APINAME/v2/${APINAME}_grpc_service_config.json"     --service-yaml "$GOOGLEAPIS/google/$APINAME/v2/${APINAME}_v2.yaml"      `find "$GOOGLEAPIS/google/$APINAME/v2" -name '*.proto'`     "$GOOGLEAPIS/google/cloud/common_resources.proto"