Add workflowhub validation package

[caroott]

Adds workflowhub@0.0.1. It tells an ARC owner whether the workflows in workflows/ and the runs in runs/ carry enough metadata to be packaged as a Workflow RO-Crate and deposited on WorkflowHub.

Every workflow and run is checked on its own and reported under its own identifier, so an ARC can hold a mix of ready and not yet ready items. The badge shows how many are ready. The ARC as a whole passes when it loads, has a license, and has at least one item that satisfies everything.

The requirements come from two sources: what ARCtrl 3.2.0 actually needs to convert a workflow or a run into a crate, and what WorkflowHub itself asks of an uploaded crate.

Two current caveats:

• The per run process table check is on purpose stricter than ARCtrl 3.2.0 needs. ARCtrl validates only the first workflow invocation, so whether a run converts currently depends on the order of its process tables. Certain combinations of processes with inupts/outputs present work or don't work. At this time, the validation requires at least the first process to have both set (they should be annotated anyways)
• Picking a WorkflowHub team is mandatory when registering, but it is not part of the ARC, so it is only mentioned in the description and not validated.

[kMutagene]

This is either weird design or too sophisticated for me to understand. Requirement.holds looks to me like it execute the test cases. so if that is the case, this package runs the test cases at least twice, one time to fill these lists and then to create the non critical tests.