Implement Stateful TextClassifier APIs.

Outstanding work tbd in other CLs
- Introduce request objects with session Ids
- Implement character based indexing for Selection events.

This CL hides the old Logger API but still keeps running so that we can
check that the modifications to the new API does not break anything.
We will remove the old Logger once we're convinced this is stable.

Please refer to I3c9ceea0863099fc4f0a5ce5e823c648ee9c4521 for previous
reviews related to this CL.

Bug: 74461129
Test: bit FrameworksCoreTests:android.view.textclassifier.TextClassificationManagerTest
Test: bit CtsViewTestCases:android.view.textclassifier.cts.TextClassificationManagerTest
Test: bit CtsWidgetTestCases:android.widget.cts.TextViewTest
Test: bit FrameworksCoreTests:android.widget.TextViewActivityTest
Change-Id: Iea744f1fa5964b4399290c31863ebeffa99af8d3