Compatible behavior for non-resizable activity (1/N)

Introduce a fixed screen mode for non-resizable activity. If the
activity has fixed of orientation or aspect ratio, it can keep the
original configuration when the size of container is changed.

The original bounds and screen related attributes are set to the
override configuration. So when the activity meet:
 - Move to another display
 - Display size changed
The activity won't be relaunch or receive unexpected config changes.

The next CL will utilize this information to scale and offset the
windows of the non-resizable activity into the corresponding place
according to different use cases.

Bug: 112288258
Test: atest ActivityRecordTests
Change-Id: I5050f180e5d6c6c05514f0dc79102c0668c75c23