Closed
Description
Since this SDK hasn't shipped yet, we can safely make this update and adhere to the C++ guidelines.
SDK Clients are designed to be immutable as per the guidelines, so it should be safe to mark them as const so that a user referencing client instances as const& will be able to call any of the marked methods.
DO ensure that all service client classes thread safe (usually by making them immutable and stateless).
Similar to #6328
Codegen issue for context: https://github.com/Azure/autorest.cpp/issues/464