StabilityCalculator in VDM

Implement a StabilityCalculator in VDM for consolidating
platform signals for computer control stability. Currently, it
provides a temporary solution by triggering the stability listener
after a fixed timeout on input events or application launches.
Long term, we would add more functionality here to improve the
stability detection by incorporating actual signals from the
framework.
This change adds new APIs for stability listener, and deprecates
the existing stability hints APIs.

Test: atest ComputerControlSessionTest, atest ComputerControlTests
Bug: 428957982
Flag: android.companion.virtualdevice.flags.computer_control_access
Change-Id: I41ef50cd1dd084f7d14cd7c09256d6201c8ad9e5