[🐴] Fully implement keyboard controller (#4106)

* Revert "[🐴] Ensure keyboard gets dismissed when leaving screen (#4104)"

This reverts commit 3ca671d9aa.

* getting somewhere

* remove some now nuneeded code

* fully implement keyboard controller

* onStartReached check

* fix new messages pill alignment

* scroll to end on press

* simplify pill scroll logic

* update comment

* adjust logic on when to hide the pill

* fix backgrounding jank

* improve look of deleting messages

* add double tap on messages

* better onStartReached logic

* nit

* add hit slop to the gesture

* better gestures for press and hold

* nits

src/components/dms/MessagesListHeader.tsx

@@ -1,5 +1,5 @@
 import React, {useCallback} from 'react'
-import {Keyboard, TouchableOpacity, View} from 'react-native'
+import {TouchableOpacity, View} from 'react-native'
 import {
   AppBskyActorDefs,
   ModerationCause,
@@ -46,7 +46,6 @@ export let MessagesListHeader = ({
     if (isWeb) {
       navigation.replace('Messages', {})
     } else {
-      Keyboard.dismiss()
       navigation.goBack()
     }
   }, [navigation])