Introduce new metadata model

[gutzbenj]

Dear @amotl ,

I'm working on a new data model for parameter definition based on pydantic models. What's your opinion on this?

[amotl]

Hi @gutzbenj. I recently became a fan of attrs, a bit more than I had been before, specifically after learning about its new @define API, which works wash & go and DWIM as hell for me.

Examples:

• https://github.com/crate/commons-codec/blob/main/src/commons_codec/model.py
• https://github.com/crate/commons-codec/tree/main/src/zyp/model

So, if your intentions are more to build a parameter model, than needing the whole validation machinery of Pydantic, this could maybe also spark your interest.