Automation of stub generation in sample_measurement example

[Jotheeswaran-Nandagopal]

Tech Debt

• Automate the stubs in sample_measurement in the example directory to prevent them from becoming outdated.
• update the build to check whether the protobuf codegen is out of date.

Refer,

• https://github.com/ni/measurement-plugin-python/blob/main/packages/service/scripts/generate_grpc_stubs.py
• https://github.com/ni/measurement-plugin-python/blob/main/.github/workflows/check_nims.yml#L82

Context

• #901

AB#2863054

[bkeryan]

@Jotheeswaran-Nandagopal For this one, it's ok to hardcode the call to python -m grpc_tools.protoc ... in check_examples.yml