Track interaction state

[BadMagic100]

Is your feature request related to a problem? Please describe.
For interactable elements such as buttons and text inputs, track the state of interaction. For buttons, this is hovered, unhovered, and held. For text inputs, this is hovered, active, and deselected

Additional context
Research is needed to determine feasibility; if disabling/hiding elements does not fire the deselected event we cannot reliably track state.

[BadMagic100]

The setter for CanvasGroup.interactable may hold answers for this. Might also want to verify behavior when mousing off of a button onto nothing