Future proof Tables expression parser

[christothes]

According to dotnet/runtime#47231 , we may need to do some work to future proof our expression parser implementation in Tables.

Although we do not implement IQueryable directly, we're still using reflection and comparing against argument count in a couple of places like here though. Might be worth being more explicit or adding unit tests in case someone ever puts new overloads in .NET Core vNextNextNext.

[pallavit]

@christothes do you still see value in making this change?