textarea 建议添加字数统计

[531431988]

• I have searched the issues of this repository and believe that this is not a duplicate.

What problem does this feature solve?

很多常见的应用场景

What does the proposed API look like?

右下角显示字数统计

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This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 7 days

[github-actions]

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.