fix(db-postgres): build near sort query properly for point fields

[r1tsuu]

Continuation of #12185 and fix #12221

The mentioned PR introduced auto sorting by the point field when a near query is used, but it didn't build actual needed query to order results by their distance to a given (from the near query) point.

Now, we build:

order by pont_field <-> ST_SetSRID(ST_MakePoint(lng, lat), 4326)

Which does what we want