AutoSize TextView - major fixes

* splits the auto-size setup part from the execution
  function:
** in TextView CTOR we only setup and we leave the
   actual auto-sizing execution to happen in the
   view||text layout  phase
** encapsulated the conditions needed to start
   applying auto-size in the execution function

* introduces a private way to set the text size
  without requesting a new layout pass; auto-size
  always uses this practically setting the text
  size on the paint object and creating a new
  layout

* calls execution autoSizeText() from within
  TextView#checkForRelayout() if not requestLayout()
  is needed => this makes sure that auto-size will be
  performed even if a view layout is not requested,
  but only a text layout

* fixes the calculation of the sizes available for
  auto-size when configured via granularity

Bug: 62050646
Bug: 38409622
Bug: 38440435
Bug: 62109627
Test: run cts --test android.widget.cts.TextViewTest -m \
      CtsWidgetTestCases
Test: manually tested the new behaviors in demo apps
Test: new test attached in topic

Change-Id: I4ccaa0a0afa3b5aa47213442d0029da2c74e7eb4

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