Cannot import GeoBoundingBoxQuery, GeoDistanceQuery, and GeoPolygonQuery from couchbase.search

All types of search queries can be imported from the couchbase.search module, with the exception of GeoBoundingBoxQuery, GeoDistanceQuery and GeoPolygonQuery.

For example, `from couchbase.search import GeoDistanceQuery` does not work, but `from couchbase.search import MatchQuery` does.