Few update on contacts storage settings.

1. Add account preference category to contacts storage settings page
2. Preload account icon in settings constructor
3. Re-fetch account in controller to refresh the default account after user sets a different default account.

Test: atest SettingsRoboTests:com.android.settings.applications.contacts.ContactsStorageSettingsTest
atest SettingsRoboTests:com.android.settings.applications.contacts.ContactsStoragePreferenceControllerTest
Bug: 368641291
Flag: android.provider.new_default_account_api_enabled

Change-Id: I3ca2a7a0905118c7a3a47fe4573781ae86c246bd