Event Schemas with Pydantic

[d-chambers]

I am looking into tearing out ObsPlus' hinky code for json conversion and replacing it with Pydantic models in the event_schema branch. It looks promising so far.

The only downside is that we will need to take pydantic as a hard dependency. I am not worried about the reliability of the project as it is well supported and used by several mainstream packages (fast-api, typer). Nothing we are doing at NIOSH would have a problem with taking it as a new dependency but I want to check with other users. Particularly @calum-chamberlain for RT_EQCorrScan .

[calum-chamberlain]

I'm pretty sure I don't have a problem with adding pydantic as a dependency - RTEQcorrscan already has a hideous list of dependencies, as long as pydantic doesn't clash with anything else (it has pretty minimal dependencies itself, and I don't think any should be a problem).

Would this replace cat_to_dict and dict_to_cat?

[d-chambers]

Ok sounds good.

This wouldn't replace those functions, just provide a more straight forward way of doing the conversion. The ObsPlus public API shouldn't change much, if at all.