[Clipclops] Refactor message list (#3832)

* rework the list for accessibility

* Reverse reverse

* progress

* good to start testing

* memo `MessageItem`

* small hack

* use our custom `List` impl

* use `ScrollProvider` for `onScroll` event

* remove use of `runOnJS`

* actually, let's keep it

* add some comments

---------

Co-authored-by: Eric Bailey <git@esb.lol>

src/screens/Messages/Conversation/useScrollToEndOnFocus.web.ts

@@ -0,0 +1,6 @@
+import React from 'react'
+import {FlatList} from 'react-native'
+
+// Stub for web
+// eslint-disable-next-line @typescript-eslint/no-unused-vars
+export function useScrollToEndOnFocus(flatListRef: React.RefObject<FlatList>) {}