Support content description with app name

The logic is like:
1. If content description string with app name placeholder is available,
   and we also have a app name, then we will use this string.
2. Otherwise, fallback to content description string without app
   name placeholder.

Test: atest frameworks/base/core/tests/coretests/src/android/view/textclassifier/
Test: Actually see the content description with app name is formatted
      properly

BUG: 128541828

Change-Id: Iee1dc8d4a429d759d9ab3f4b84dc1ad13b698cdb