chore: add commitlint to enforce conventional commits (#365)

Author: mshima

.husky/commit-msg

@@ -0,0 +1 @@
+npx --no -- commitlint --edit $1

commitlint.config.ts

@@ -0,0 +1,5 @@
+import type { UserConfig } from '@commitlint/types';
+
+export default {
+  extends: ['@commitlint/config-conventional'],
+} satisfies UserConfig;