Wait for config callback to reduce flakiness

Previously, we have already wait for config callback from
WindowContexListenerController and WindowTokenClient,
but the test is still flaky. A theory is that the client side received
the config change binder call but the config value hasn't applied to
the Resources.

This CL wait for the config callback via registering ComponentCallbacks
to ensure the Resources value is updated.

Test: atest InputMethodDialogWindowContextTest#testGetSettingsContextOnDualDisplayContent
Bug: 296622353
Change-Id: I4b491d35ae9ce73eb40c8b866ba91e9d7f6442db