Add support for Tags

[jimeh]

The ability to manage Tags in Terraform.

Tasks

• [ ] Add katapult_tag resource, with attributes:
  • id (computed)
  • name
  • color
• [ ] Add katapult_tag data source, with attributes:
  • id
  • name
  • color
• [ ] Add katapult_tags data source to list all tags, with a tags attribute that is a list of tags using the same schema as the katapult_tag data source.

[jpswade]

We need the API first.

[ikadix]

AFAICT only thing missing from the API for this would be returning the tag color in the list tags response.

We could make an individual request for each tag in the list to get the color but it feels like fixing this in the API would be preferable.

We can also go ahead and release this without color in the katapult_tags data source in the meantime I imagine.