Andy Holmes 32b9109967 overview: Provide public access for search provider registration
Provide a reasonably public way to register and unregister search
providers, without adding too much API.

`Main.overview.searchController` provides access that may be generally
useful, while `SearchController.addProvider()` and
`SearchController.removeProvider()` provide a simple interface for
extensions.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2783>
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