feat: migrate to the new system.

old/src/snowflake.ts

@@ -0,0 +1,9 @@
+const EPOCH = 1420070400000; // Discord's EPOCH
+
+// Snowflakes will never be a string
+export function isSnowflake(snowflake: number | string): boolean {
+    snowflake = Number(snowflake);
+    return (
+        Number.isInteger(+snowflake) && snowflake > 4194304 && !isNaN(new Date(snowflake / 4194304 + EPOCH).getTime())
+    );
+}