Add separate MarkerClick and InfoWindowClick events for Pins (#6079)

Add separate MarkerClick and InfoWindowClick events for Pins (#6079)

* Add separate MarkerClick and InfoWindowClick events for Pins

* Mark Pin.Clicked obsolete

* Use for loops to look up Pins in renderers.

* Add custom EventArgs for MapClicked and InfoWindowClicked

* Update MapGalleryPage for new events

* Obsolete messages and other cleanup

* Correct the pragma when calling Pin.SendTapped

* Change obsolete message to say 4.2.0

* Ignore warning on Pin.SendTap() on other platforms

* Update obsolete messages to 4.3.0

Co-Authored-By: Samantha Houts <samhouts@users.noreply.github.com>
fixes #2509
fixes #3131
fixes #5490