Inconsistent naming method with protobuf entities' "*_pb.d.ts"

Should we consider changing the naming convention here to make things more consistent?

https://github.com/grpc/grpc-web/blob/5831a96b5665e17516c11ff44c0e13947bb92cad/javascript/net/grpc/web/generator/grpc_generator.cc#L1482

Start by reading javascript/net/grpc/web/generator/grpc_generator.cc at the referenced line and compare its naming with the protobuf entities' "*_pb.d.ts" convention. Determine which naming change would make the generated entities consistent, then verify the resulting generated names; the issue needs an agreed convention before implementation can be considered done.

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