NI VISA support for NI Linux RT

[bretter]

Hello NI gRPC team!

I'm checking in on support of gRPC for NI VISA on NI Linux RT. I have a customer who wants to use gRPC to interface with a cRIO from a Linux desktop but they require NI VISA support to use their serial modules on the cRIO. Is this support on the roadmap?

More generally, it seems like NI Linux RT has a lot of drivers that are still showing as unsupported. Is gRPC support for NI Linux RT platform an area where we are expecting to invest in the future?

[reckenro]

NI VISA is supported with gRPC on NI Linux RT. I realized the README table is just incorrect.

Updating that with this PR: #1153