Move aconfig files to aconfig folder

- Set packageName as com.android.launcher3
- Follow folder structure as per go/sysui-aconfig-structure

Bug: 294913042

Test: adb shell device_config put launcher com.android.launcher3.enable_all_apps_rv_preinflation true

Flag: enable_all_apps_rv_preinflation

Change-Id: Ib45a24d9100b657e7776c6120bdf9625533e9ed7