Make InputMethodPreference support work profile

Introduces userId into InputMethodPreference and
per-user context into InputMethodSettingValuesWrapper.

So we can handle the work input method if it's work flow.

Bug: 174360557
Bug: 197707782
Test: Manual test as bug video
Test: atest SettingsLibTests:com.android.settingslib.inputmethod.InputMethodPreferenceTest
Change-Id: Ic233cf183c8783937e638f9ab672c248a136c071