[Feature Request] Make CharacterController expose boolean "isSliding" to play sounds/animations when it happens.

When using the character controller you can set it to prevent climbing and force sliding down slopes bigger than a threshold.

It would be very useful to be able to get informed about this state of sliding. Right now I don't know how to, for example, deny the player the ability to jump while sliding. Without denying it, the player can circumvent the slide and just keep jumping to get higher.

Another thing this would allow for is playing a sliding sound, or letting the character play a sliding animation.