Add metadata for wine_quality_white

[trangdata]

Work in progress.

Add metadata for wine_quality_white.

• [x] Update the information on the dataset's metadata.yaml file.

• [x] Verify the source for the dataset: Check here.

[trangdata]

There are a few rows in the original source that is not in the dataset (see here).

In general, I suspect a lot of other checks will be similar as well (e.g. minor floating-point differences between the dataframes). What should we do in these cases? Should we add back these rows? @weixuanfu @lacava

[trangdata]

@weixuanfu Since we agree on adding the rows back in, could you help me do that so we can merge, please? 🙏

[weixuanfu]

I will do that next week with adding an parameter (maybe called 'allow_na') in fetch_data to control it to export dataframe with or without NAs.

[lacava]

I will do that next week with adding an parameter (maybe called 'allow_na') in fetch_data to control it to export dataframe with or without NAs.

I like this idea!