edgedb-js doesn't pick up environment variable EDGEDB_DATABASE

[haikyuu]

It would be nice to be able to EDGEDB_DATABASE=test npm start and the client would use the database passed instead of the default one.

That would be aligned with the behaviour of edgedb cli and would cause no surprises since the user added the env. variable explicitly.

See discussion edgedb/edgedb#2902

That's just a nice to have, because it can actually work like this: createPool({database:process.env.EDGEDB_DATABASE}) and would default to the default db if the env. variable is undefined