Consolidate mTaskBounds logic to mConfiguration

After the horizontal layout feature, the split layout is not just
determined by task bounds, but the whole task Configuration should
be take account.

This CL removes the mTaskBounds logic and consolidate to use
TaskContainer#mConfiguration instead. This CL also introduces
ActivityClient#getTaskConfiguration to obtain task config at
TaskContainer initialization.

Bug: 240219484
Test: atest WMJetpackUnitTests

Change-Id: I5725ac92d841c53675c78b9e50e0d3fee3973f37