feat(edt): Create a repository for UiModeManager force invert state

This will be used by Status Bar region-sampled lightness control in
followup changes.

Bug: 379760792
Test: ForceInvertRepositoryTest
Flag: EXEMPT unused in current CL; followup callers are flagged
Change-Id: I418b740c787e3ff28ad4055e92d2a59133cd84a5