Add a VISA plugin for generic VISA support

[pbirkhol-ni]

• This contribution adheres to CONTRIBUTING.md.

What does this Pull Request accomplish?

• Add a MeasurementLink VISA library with all of the normal APIs plus a palette file. There is one main difference between this API and other driver APIs:
  • Both the Initialize and Get Connections VIs require an instrument type id input. Since we are making a generic VISA API, the customer gets to define their own instrument type id in the pin map so we can't know what it is unless they tell us.
• Add a VISA ISessionFactory. This has a few differences from normal ISessionFactory implementations
  • The instrument type id is not a static value so it must be passed in during construction and then it gets returned by a property.
  • The Close MeasurementLink Session.vi ignores the initialize and close session behavior input. It just unconditionally calls VISA Close because the close behavior is defined during init.
  • The VISA Open for gRPC Session.vi has an Open / Close Behavior input that has an Auto enum value. However, the ISessionFactory initialize and close session behavior enum does not have an Auto value. What this means is that we never pass Auto to VISA Open for gRPC Session.vi, which I think is okay but I can't 100% convince myself.
• Add all of the standard tests that we write for all of our plugins. Some of them are disabled for two main reasons:
  • They require a pre-release VISA driver on spawningpool. My preference would be to wait for the official release before we install it.
  • Even with the prerelease driver installed, however, a few tests still fail due to AB#2582855. Once that bug is fixed, those tests should pass, although I had to take an educated guess on what error code we should be expecting.

What testing has been done?

Auto tests.