feat(orion): add rest api for waitlist

go/migrations/000010_waitlist.down.sql

@@ -0,0 +1 @@
+DROP TABLE IF EXISTS waitlist_entries;

go/migrations/000010_waitlist.up.sql

@@ -0,0 +1,7 @@
+CREATE TABLE waitlist_entries (
+    id SERIAL PRIMARY KEY,
+    email VARCHAR(255) NOT NULL UNIQUE,
+    metadata JSONB NOT NULL DEFAULT '{}',
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    invited_at TIMESTAMPTZ
+);