* Make namespace aliasing consistent everywhere; enforce with clj-kondo

See the table of aliases in .clj-kondo/config.edn

Notable patterns:
- `[metabase.api.foo :as api.foo]`
- `[metabase.models.foo :as foo]`
- `[metabase.query-processor.foo :as qp.foo]`
- `[metabase.server.middleware.foo :as mw.foo]`
- `[metabase.util.foo :as u.foo]`
- `[clj-http.client :as http]` and `[metabase.http-client :as client]`

Fixes #19930.