Implement Rust-based emote database and REST API

migrations/20240101000000_create_emotes.sql

@@ -0,0 +1,8 @@
+CREATE TABLE IF NOT EXISTS emotes (
+    uuid TEXT PRIMARY KEY NOT NULL,
+    name TEXT NOT NULL UNIQUE,
+    alias TEXT,
+    image_key TEXT NOT NULL,
+    created TEXT NOT NULL,
+    modified TEXT NOT NULL
+);