Make azure_data_cosmos::clients::CloudLocation public

[hanhossain]

I was trying to use the SDK against the CosmosDB emulator, and it looks like CosmosClientBuilder has a few public methods which aren't usable right now as CloudLocation is not public. This one-liner exports CloudLocation as public to allow those methods to be used.

[rylev]

Thanks! It looks like CI doesn't pass because the newly public CloudLocation is not properly documented (and we require all public items to be documented). Would you mind trying to document the struct?

[rylev]

Thanks!