Add some view utils

[L-Mario564]

Addresses #2610 & #3392.
#2153 can be closed if docs are added for these additions.

This PR adds some utilities that can be used with views + Bugfix.

• Added getViewSelectedFields. Similar to getTableColumns but for views.
• Fixed a bug where nested properties were disallowed within views and specifying a table instead of a column resulted in never instead of mapping it to that table's columns.
• Added $inferSelect method to views.
• Added InferSelectViewModel. Similar to InferSelectModel but for views. Not sure if we want the latter to be used for both views and tables so I created a separate type to avoid adding more responsability to the latter type.
• Added isView util function.