Shortcut permissions for default text classifier

- Add two shortcut related permissions as SystemAPI for the default
text classifier.

- The default text classifier package name still comes from the
system resource.

Bug: 73083596
Bug: 71555985
Test: atest CtsPermission2TestCases
Test: Manual test with a test package, with the following in config.xml
<string name="config_defaultTextClassifierPackage" translatable="false">com.example.android.pm.shortcutlauncherdemo</string>

Change-Id: I19081d9d6ba0b33eb25d19aa55b4fe2f26a75897