Add Gen3 Workflow cli and tool.

[nss10]

Link to JIRA ticket if there is one: MIDRC-892

New Features

• Adding Gen3 Wrapper command gen3 run that relays any command sent to it by adding GEN3_TOKEN env var.

[github-actions]

The style in this PR agrees with black. ✔️

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[paulineribeyre]

Overall looks good, but i'm hoping we can find a way to forward all the command arguments to nextflow. Meaning that whatever text is after gen3 workflow would be forwarded to nextflow directly. Not all nextflow commands start with "run", we shouldn't hardcode it.

For example: gen3 workflow -C my.config run workflow.nf should call nextflow -C my.config run workflow.nf

As an added bonus, this would make this tool generic - you could run gen3 workflow --workflow-agent python script.py and it would run python script.py.

If you get this to work, we could rename the tool so it's truly generic: gen3 wrap <command> <arguments> to run the command with a GEN3_TOKEN env var 🎉

Please make sure to include documentation on the generic usage (if relevant) and the nextflow usage (such as using $GEN3_TOKEN in the config)

[nss10]

If we were to achieve the gen3 wrap functionality, in order to run a nextflow workflow say on "main.nf", do we do,

gen3 wrap workflow run main.nf

Since, having nextflow as the default workflow-agent for a generic function doesn't totally make sense.

[paulineribeyre]

@nss10 In that case i think there shouldn't be a default

[paulineribeyre]

Looks great, minor comments