The PointerInfo provided in onPointerObservable has an undefined pointerType on MacOS Safari

[AmoebaChant]

Repro

• Bug repro on playground:
• Expected result: In Safari, mousing over the scene should display "event.pointerType = mouse" in the UI
• Current result: Only in Safari, it actually shows ".pointerType is missing"

Desktop (please complete the following information):

• OS: MacOS
• Browser: Safari

Additional context
It appears that Safari supports pointerType in the pointer* events, but Babylon currently wires up to the mouse* events for Safari which don't support that field. See GetPointerPrefix() in tools.ts.