Specify language tag and layout type when creating virtual keyboard.

1) Added languageTag in VirtualKeyboardConfig which holds a BCP 47
   language tag.
2) Added layoutType in VIrtualKeyboardConfig which holds the type of the
   layout such "qwerty".
3) Pass the above layout info to native input reader in a
   similary way that display ID association is handled.

Bug: 237537306
Test: atest VirtualKeyboardTest, atest inputflinger_tests

Change-Id: Ib37f4785e6c087d58d7b54565ddbaf257a6c0871