Move DisplayFoldFeature to common package.

Move DisplayFoldFeature to common package. To unify Sidecar and
Extensions we should have minimal code in Extensions. A start to this is
to move the independent DisplayFoldFeature and create a copy in common.

Flag: EXEMPT refactor
Bug: 347964255
Test: atest WMJetpackUnitTests
Change-Id: I8a7062b0b0e82644e55bc3195533281bc7924b66
12 files changed