

TITLE
Log metrics along with hparams in TensorBoardCallback

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# 🚀 Feature request

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     Please provide a link to the paper and code in case they exist. -->

Log metrics along with hparams in TensorBoardCallback.

## Motivation

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     related to a problem? e.g., I'm always frustrated when [...]. If this is related
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It seems useless to log hparams with empty metric dict because the training arguments are already logged in the text section. Now users can see only a blank screen when they click on the HPARAMS of the TensorBoard. So I think it will be better to call `add_hparams` with evaluation metrics when available. Otherwise just don't call this function.

