EdgeDB minimum expression repo

This repo contains a minimal EdgeDB setup with a schema based on the tutorial, and a few sample queries:

• Simple scalar queries
• Queries to return an Object and how to work with the Value enum
• Query returning json to then deserialize into a Rust struct
• Query using the Queryable derive macro, allowing deserializing into a Rust struct without needing intermediary json
• Queries using arguments (e.g. $0, $1, etc.) requiring casts in EdgeDB and showing the relation between Rust and EdgeDB types

First clone the repo, then:

• Make sure you have EdgeDB installed
• Type edgedb project init and follow a few quick instructions. (Call the project example or whatever you like) You should have a running instance.
• (Optional if curious: type edgedb instance list to see it and then type edgedb if you want to play around with the REPL a bit. (You can also type edgedb ui if you want to work through the UI) The schema hasn't been applied yet, so leave the REPL with \quit and:)
• Type edgedb migration create. You should see a file called 00001.edgeql show up in the migrations folder. You don't need to do anything with this file - it's just a record of the instructions used to migrate the schema to its current state. (Very readable though so take a look if curious)
• Type edgedb migrate to finish the migration.
• Then just type cargo run and see the output.