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feat: add float show (#986)

* feat: add float show

* reuse Show::to_string

* add some todo note

* fix ci

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Co-authored-by: Hongbo Zhang <bob.hongbo.zhang@foxmail.com>
Co-authored-by: 东灯 <me@lampese.com>
Co-authored-by: Hongbo Zhang <bobzhang1988@gmail.com>