Enable SelectionArea double tap/triple tap gesture support for mobile…

… platforms (#149295)

This change enables double tap / triple tap support in SelectionArea for mobile platforms:
Android / Fuchsia: 
- On native, these platforms allow for double tap / double tap + drag to select word-by-word.
- On web using touch, these platforms only support double tap to select word.
- On web and native using a mouse, these platforms support double click / double click + drag to select word-by-word, and triple click / triple click + drag to select paragraph-by-paragraph.

iOS:
- On native, these platforms allow for double tap / double tap + drag to select word-by-word.
- On web using touch, these platforms do not support double tap/triple tap gestures.
- On web using touch, these platforms allow support double tap + drag gestures.
- On web and native using a mouse, these platforms support double click / double click + drag to select word-by-word, and triple click / triple click + drag to select paragraph-by-paragraph.

Part of: flutter/flutter#129583