PowerFx implementation in Dataverse Accelerator (Low Code Plugins) does not yet support IsType

[cchannon]

The IsType function in the Dataverse Accelerator implementation of the PowerFx runtime does not yet support IsType (returns the error "IsType is a known but not supported function").

This is an issue because AsType on its own is not failure-safe, so the low code plugins cannot safely handle polymorphic attributes.

I'm willing to help implement this capability with my own Open-Source contributions, just looking for guidance on where to contribute as well as any implementation guidelines the FT team has to offer.