Handle long text for share/cut/copy operations.

When TextView or EditText contains text that is larger than the
total parcelable limit, some of the FloatingToolbar operations would
crash.

This CL changes the behavior as follows:
- Show a toast message if cut or copy operation fails because it cannot
  set the primary clip.
- Trim the text for share and process_text actions
- A simple app with an EditText and a long text in it, would not open
since Autofill value was being sent over IPC. Trimmed the text that is
sent for Autofill feature.
- Trim the value send to accessibility services

Test: bit CtsWidgetTestCases:.TextViewTest
Test: bit FrameworksCoreTests:android.widget.TextViewTest
Test: bit FrameworksCoreTests:android.text.TextUtilsTest
Test: Manual sample app test

Bug: 8013261
Change-Id: Ia0df6b4eb4c13071a1bf75cedac7241c7239663c