Provide more information to consumable resources

[apmasell]

Plumbs the database workflow run creation time and max-in-flight-per-workflow to the consumable resource API.

Jira ticket:

• Includes a change file
• Updates developer documentation

[avarsava]

Why?

[apmasell]

These are for the priority consumable resource system.

• one part will allow scoring by max-in-flight and it makes sense to have the customised value from the database rather than the blanket value that is currently in use
• there is a priority escalation system that allows raising priority as a job waits longer, so it needs to know when the job started.