feat: initial register functionality

migrations/2023-05-15-142901_create_users/down.sql

@@ -0,0 +1,2 @@
+-- This file should undo anything in `up.sql`
+DROP TABLE users;

migrations/2023-05-15-142901_create_users/up.sql

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+-- Your SQL goes here
+CREATE TABLE users (
+    discord_id UNSIGNED BIG INT PRIMARY KEY NOT NULL,
+    email TEXT UNIQUE NOT NULL,
+    first_name TEXT NOT NULL,
+    last_name TEXT NOT NULL
+);