Add feature flag and attribute for responsive grid

This shouldn't change anything in the grids, only support the creation of responsive grids in the future. For now, to check that the flag works, turn it on and check the dumpsys. There is also a dump test created for this.

Fix: 277064696
Fix: 277064702
Test: DeviceProfileResponsiveDumpTest
Flag: ENABLE_RESPONSIVE_WORKSPACE
Change-Id: I1bef87043a100234bd661cd6ac00007fdc654116