Add manifest attribute requestOptmizedExternalStorageAccess

Add new manifest attribute requestOptmizedExternalStorageAccess.
When the flag is set, app requests for performance optimisations for
file path operations. Apps get this performance optimisation by
bypassing database operations as part of file path operations. Hence,
when the flag is set, app will be resposible to keep MediaStore database
consistent for its file path operations.

App should hold android.Manifest.permission#MANAGE_EXTERNAL_STORAGE
permission or SYSTEM_GALLERY role, otherwise the flag will be ignored.

The default values is
- True if
* if app has android.Manifest.permission#MANAGE_EXTERNAL_STORAGE
permission and targets targetSDK<=30.
* app has SYSTEM_GALLERY role and targetSDK<=29.
- False otherwise.

Bug: 178209446
Test: atest
android.scopedstorage.cts.device.BypassDatabaseOperationsTest

Change-Id: I951c3001c2b7dbe163b3bfecef4ee8ad350230ae