Support Freeform Reference Design

[bwJuniper]

Figure out what to do about Freeform.

Add support for /api/design/config-templates

Add support for /api/blueprints/ with
{
"design": "freeform",
}
identify other things and make sure only freeform things can be done to freeform blueprints with validation.

[bwJuniper]

/api/blueprints/{blueprint_id}/config-templates-assignments
/api/blueprints/{blueprint_id}/config-templates-import
/api/blueprints/{blueprint_id}/config-templates

[bwJuniper]

These API endpoints are secondary and can be implemented after the basic Freeform functionality.

/api/blueprints/{blueprint_id}/ra-group-generators
/api/blueprints/{blueprint_id}/ra-groups
/api/blueprints/{blueprint_id}/ra-local-pool-generators
/api/blueprints/{blueprint_id}/ra-local-pools
/api/blueprints/{blueprint_id}/ra-resource-generators
/api/blueprints/{blueprint_id}/ra-resources