Add underwater stencil and audio to NH funnels

[bruvin-sky]

Feature

Would be nice if the loud booming sounds of the sand column could be added to the sand funnel, and perhaps waterfall sounds from TH for the water funnels!

Additionally, would the funnel's mesh allow an underwater stencil to be added the water funnel's interior? The water funnel just goes transparent when the player is inside it at the moment

Context

No response

[xen-42]

Audio will be simple enough
Underwater stencil we'll want to add a funnel model to our Unity asset bundle, since currently it just grabs the funnel model (which isnt double-sided) and slaps TH water materials on it