feat: Add users create and list commands (#1111)

This allows for *extremely basic* user management.

coderd/database/migrations/000001_base.up.sql

@@ -12,13 +12,10 @@ CREATE TYPE login_type AS ENUM (
 CREATE TABLE IF NOT EXISTS users (
     id uuid NOT NULL,
     email text NOT NULL,
-    name text NOT NULL,
-    revoked boolean NOT NULL,
-    login_type login_type NOT NULL,
+    username text DEFAULT ''::text NOT NULL,
     hashed_password bytea NOT NULL,
     created_at timestamp with time zone NOT NULL,
     updated_at timestamp with time zone NOT NULL,
-    username text DEFAULT ''::text NOT NULL,
     PRIMARY KEY (id)
 );