[WebContentFilters] Create an api to pass supported app package names to...

[WebContentFilters] Create an api to pass supported app package names to related web content filters preferences using messenger service.

Bug: 417805803
Test: atest SupportedAppsApiTest
Flag: android.app.supervision.flags.enable_web_content_filters_screen
Change-Id: Iaf301dadd449579759fbbe0386c9d5ceaf02db1d