Support generating a client for a specific version of a measurement plug-in

[bkeryan]

Problem to Solve

Support for client versioning in #925 always generates a client for the latest version of each service. This is the most common use case, but some users may want to generate a client for a specific version.

Proposed Solution

Add a --measurement-service-version parameter. If specified, pass it to get_measurement_stub -> resolve_service.

It could also make sense for interactive mode to display multiple versions and let the user choose.

AB#2865966

[Avinash2Suresh]

For the --all mode, if we are planning to create clients for all versions, we need to consider how to update the module and class names for the same measurement with different versions.