dscc-scripts connector should allow for dev and test deployments

[kyle-mccarthy]

The docs recommend separate deployments for production, dev/head and test/qa but that currently isn't possible with the dscc-scripts connector command.

The easiest implementation would probably be to expose a new updateDeployment handler, similar to the updateProduction one. This could be exposed as a command such as dscc-scripts connector update_deployment {deploymentId} {description}.

Alternatively, it would be nice to be able to add custom "dsccConnector" entries in the package.json. This would probably provide a better dev experience but the implementation would need to be ironed out.

[diminishedprime]

Thanks for the feature request. This would be a great first PR for anyone that's interested in implementing this functionality.