Add conditional inspector field attribute

[JadenBalogh]

This would just be a nice QoL change for creating clean inspector interfaces. Ideally we would be able to hide/show certain fields of a class in the inspector based on the value of another field on that same object. i.e. something like this:
https://forum.unity.com/threads/draw-a-field-only-if-a-condition-is-met.448855/