Possible to use underscores in IDs?

[xuhdev]

Currently IDs use dashes instead of underscores:

exchange-metadata-converter/dax-data-set-descriptors/jfk.yaml

Line 1 in 7160fd4

id: noaa-weather-data–jfk-airport

Using underscores potentially eases Python users' life by allowing them to type IDs as variable names (say `dax.datasets.noaa_weather_data_jfk_airport). If it's not possible, we would have to do a dash-underscore conversion on one end.

[ptitzler]

We'll check with the OpenAIHub team to see if this would pose a problem. My understanding is that we used this convention to mimic what was implicitly done in https://github.ibm.com/IBMCode/Code-Data, where the id is the slug name.

[ckadner]

Related issue: machine-learning-exchange/mlx#209

[ckadner]

For MLX we need to ensure that given an id that contains underscores (_), the generated DLF/DataShim YAML has a metadata.name that conforms to DNS-1123 subdomain naming restrictions (must consist of lower case alphanumeric characters, - or .)