feat: support flat config (#487)

* refactor: update scripts

* refactor: remove unnecesarry codes

* refactor: update scripts

* chore: change node register to jiti from ts-node

* feat: flat config implementation

* fix: update separate

* fix: integration tests

* fix: format

* chore: bump node

* chore: bump eslint

* fix: forgot commit

* fix: forgot lock file

* fix: add ignore lint for tests

* fix: test

* docs: updates

* Create pink-hairs-fail.md

---------

Co-authored-by: Yosuke Ota <otameshiyo23@gmail.com>

Author: kazupon

.changeset/pink-hairs-fail.md

@@ -0,0 +1,5 @@
+---
+"@intlify/eslint-plugin-vue-i18n": minor
+---
+
+feat: support flat config

.eslintignore

@@ -7,6 +7,7 @@
 /dist
 /docs/.vitepress/cache
 /docs/.vitepress/dist
+/lib/configs/**/*.ts
 /node_modules
-# /tests/fixtures Used testcases
-/tests-integrations/config-recommended
+#/tests/fixtures # use testing
+/tests/integrations