Specify additional directories to search for datapacks

[Machine-Maker]

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale[bot]]

This issue has been automatically closed because it has not had activity in a long time. If the issue still applies to the most recent supported version, please open a new issue referencing this original issue.

[Machine-Maker]

Rebased 1.18.1

[Machine-Maker]

Rebased for 1.19

[scarfacered]

Correct me if I'm wrong, doesn't optionset.valuesOf("add-datapacks-folder") need to match acceptsAll(asList("add-datapack-folder") ?