Migrate from Plugin SearchTarget to API search Target [2/3]

- Adds support for android.app.search.SearchTarget in plugin while maintaining plugin SearchTarget support
- Introduces SEARCH_TARGET_LEGACY temporary to switch between plugin and sdk variants.
- Maps resultType and layoutType pairs to the appropriate view

Bug: 177223401
Test: Manual
Change-Id: If8d4bb7c21c47a12447dcb0c56eed8781bd21e54