Enable operations to suspend/resume workflows

Current Situation

• JS1 offers to stop a job chain, i.e. to queue any orders submitted for the job chain. When the job chain is unstopped then queued orders will start.
• JS7 does not offer a similar feature.

Desired Behavior

• Users of JS7 want to suspend a workflow similar to stopping a job chain in JS1. Any orders that reach their scheduled date will be queued and will start when the workflow is continued. The same applies to orders added while a workflow is suspended.
• When workflows are resumed then orders waiting inside the workflow will continue.
• The REST API and GUI offer operations to suspend/resume individual workflows and groups of workflows based on - optionally recursive - folder selection