Allow setting CAMS variables programmatically

[jacobbieker]

Pull Request

Description

This allows us to set variables programmatically to download for CAMS forecasts.

Fixes #

How Has This Been Tested?

Test runs

• Yes

Checklist:

• My code follows OCF's coding style guidelines
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have checked my code and corrected any misspellings

[devsjc]

Interesting that you don't need to modify the config dict CAMSConfig at all - is that what the PermissiveConfig thing does? Lets you modify config.dict() behind the scenes?

[jacobbieker]

Interesting that you don't need to modify the config dict CAMSConfig at all - is that what the PermissiveConfig thing does? Lets you modify config.dict() behind the scenes?

Yeah, the docs say it allow for arbitrary keys https://docs.dagster.io/_apidocs/config that you can access later. Would have made it more explicit, but to have it work easily for both EU CAMS and Global CAMS, seemed easier for it to be just extra keywords