[iOS/Critical] Fix ListView memory leaks (#524)

[iOS/Critical] Fix ListView memory leaks (#524)

* fix memory leaks

added sample code

changed page name

Changed page title

add screen instructions

fix copy paste error

change subview dispose logic

Fix context action memory leak

add sample code

change custom page names

Revert "change custom page names"

This reverts commit 7aaab2625d9526080ca5c51c02e909f09ee3f610.

changed class names

changes

UI test for 32206

update ui test

fix whitespace

UITests done

* run UI tests on iOS only

* fix code style

* dispose prototype

* fix child renderer issue

* add null check