3+ Part Naming Not Supported

In https://github.com/Azure/azure-functions-sql-extension/blob/bb31cd997c8655cb07b8470a8f3a13dfd6214466/src/SqlBinding/SqlBindingUtilities.cs#L168 there is the assumption that T-SQL object referencing is no more than 2 parts (i.e. `dbo.Products`).

This isn't actually true (3/4 part names are possible).

Let's identify any other places where this assumption is being made. Min bar would be to document this limitation.