[web] Introduce onMouse calbacks for tooltip component in TooltipContext

Summary: Intrroducing mause actions callbacks on tooltip component, to correctly handle clearing the tooltip.

Test Plan: Flow; Tested with the rest of diffs stack.

Reviewers: tomek, atul, abosh

Reviewed By: tomek, atul

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D4910