Add ContextualSearchConfig to add display id, etc.

Current fields:
 - Display ID (where the screenshot and interaction happen)
 - Source bounds of the invocation (navbar, home button, etc)
 - Intent extras to be passed to the Contextual Search app

NO_EXPORTED_FLAG_DELETION_CHECK=The API guarded by the
self_invocation flag was never released and is being replaced
by new APIs guarded by config_parameters.

Bug: 371552433
Bug: 401598818
Bug: 368653769
Test: Manual with stashed taskbar and Launcher support app.
Flag: android.app.contextualsearch.flags.config_parameters
Change-Id: I35e3c55edaf0b25f95e75632a6a8b4b335159db1