WIP: Migrate Job DataSource & Resource

[chasewalden]

No description provided.

[b-per]

Thanks!
Let's be extra careful with this one, 😄 and I am happy to try to add as many new tests as possible.

The API for the endpoint is a bit peculiar (e.g. especially about when we move between different schedule types etc...) and I would expect that this might be the most used resource in the entire provider.

[chasewalden]

@b-per Agreed. This is going to be given extra attention. Trying to do this incrementally. First was migrating the schemas and ensuring the docs aren't (too) different. There are some plan modifiers that need to be written for some of the custom logic (i.e. some mutually exclusive attributes, recreate on certain trigger behavior, etc). Datasource will be next followed by the Resource CRUD methods. I'll drop in extra unit/acc tests where I can.