feat(@websnacksjs/conventional): initial implementation

`@websnacksjs/conventional` is a cli program which can be used with
`husky` & git hooks to enforce that commit messages adhere to the
conventional commits standard.

packages/conventional/src/bin/main.ts

@@ -0,0 +1,10 @@
+const [command = ""] = process.argv.splice(2, 1);
+switch (command) {
+	case "commit-msg": {
+		await import("./commit-msg.js");
+		break;
+	}
+	default: {
+		console.error(`⛔ unknown command ${command}`);
+	}
+}