a-textarea show-count position

[Jeffreyli1983]

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

What problem does this feature solve?

a-textarea 数字显示只能在输入框外的右下位置，希望能自定义位置。比如：能放到输入框内的右下位置，输入框外的右上位置。

What does the proposed API look like?

Don't need new API

[github-actions]

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