DRAFT: Add partial support for Proactive rules

[bmorrissirromb]

Issue #, if available: Part of #400

Description of changes: This partially implements issue 400. Config does not support Proactive evaluation modes for Organization rules. Only single-account rules support EvaluationMode arguments.

So, this change allows single-account (non-Organization rules) rules to use proactive evaluation modes.

The CLI will have two new options:

• rdk create will support an argument for --evaluation-mode and store it in the parameters.json file
• rdk deploy (but not deploy-organization) will support --evaluation-mode by reading it from parameters.json.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.