execute atlantis operations using group tags on projects

[pseudomorph]

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• I'd be willing to implement this feature (contributing guide)

Describe the user story
Atlantis allows the ability to run targeted operations by specifying project, dir, and workspace. This ability is currently very powerful, and could be vastly improved by allowing projects to be grouped by arbitrary tags.

Describe the solution you'd like

This configuration could look something like:

atlantis.yaml

...
projects:
- autoplan:
    enabled: true
    when_modified:
    - file1
    -file2
  dir: /project/dir/path
  name: projectname
  execution_group_tags:
  - <some-environment>
  - <some-project-type>
  - etc....

and would be used in this way:

atlantis plan -t "<some-project-type>"

Describe the drawbacks of your solution
N/A

Describe alternatives you've considered
N/A