f64 support for queries in PostgreSQL

[adzialocha]

thread 'proptests::tests::filtering_queries' panicked at '[ServerError { message: "A fatal error occured in DocumentStore: error returned from database: \"-0.0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000036377018999518037\" is out of range for type real", locations: [Pos(2:13)], path: [], extensions: None }]', aquadoggo/src/proptests/tests.rs:59:5

See failing tests: https://github.com/p2panda/aquadoggo/actions/runs/4989585884/jobs/8933697399?pr=362