To address IME service context's Resources / DisplayMetrics update
when switching IME window to another display after onConfigurationChange.

We use Context#createDisplayContext to create display specific context when
display changed, to ensure soft keyboard can re-layout with correct resources.

Bug: 126930163
Test: manual with AOSP IME as below steps:
     1) Settings > Developer options > enable "Simulated Display" & "Force desktop mode".
     2) Reboot device
     3) Launch app (i.e. Contacts) with bluetooth or usb mouse in Simulated display.
     4) Tap EditText on app to see see if IME window layout correctly on simulated display.
     5) Launch app (i.e Files) on primary display.
     6) Tap EditText on app to see if IME window layout correctly on primary display.

Change-Id: I0ed6a079af1ed90c75fee1d36d5ce3ef3c41f8ed
Merged-In: I0ed6a079af1ed90c75fee1d36d5ce3ef3c41f8ed

Bug: 139893257
Change-Id: I67cbe34b4646ddfdb0868bf8eaca12100a4e7b16

Bug: 134405016
Change-Id: I85024313e36aa6450602dd17cd9bcd7220780ecd

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Bug: 136196576
Change-Id: I31b019b595c8dec9874140f575fdeb61c5866a7d

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Remove EXTENDED_TOUCHABLE_REGION_HEIGHT from LatinIME#onComputeInsets
to prevent keyboard touch region covered navigation bar
when in split-window mode with display density < 240 case.

Fix: 134893742
Test: manual as below steps:
1) Set window density as 240 with "adb shell wm density 240"
2) Launch a app (i.e. Messages) from recents activity, set as split-screen mode.
3) Tap Search bar to show IME keyboard.
4) Press home / back / recents key if it works, expect it works.

Change-Id: I596b7276041fecc50d2bc095c7e51664f632368d

Bug: 134405016
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