search: Use symbolResolver rather than searchSymbolResult in suggestions

Created by: camdencheek

We were previously using searchSymbolResults when creating suggestion resolvers, which required that we also saved a reference to a database so we could convert it to a symbolResolver. However, there's no reason we can't just create the suggestion resolver from a symbolResolver instead, allowing us to skip saving a database on the suggestion resolver type.

Additionally, this will make it easier to remove the database from searchSymbolResult