DCM -> DV user notification APIs

[pameyer]

Notifications for users about their DCM uploads, mediated through Dataverse (vs having the DCM directly sending email).

1. Success message: dataset has been uploaded, checksums validate.
2. Error message: dataset has been transferred; checksums do not validate; rerun script and/or contact support.

[djbrooke]

• Need message text
• @pdurbin may already have the code

[pdurbin]

Heh, true. Just like for #3725 I would plan to dust off the code in https://github.com/pdurbin/dataverse/tree/3145-dcm

As I mentioned in sprint planning, the "When rsync upload begins, send a message to Dataverse" feature requested by @mheppler @TaniaSchlatter @dlmurphy at sbgrid/data-capture-module#21 is related.

[pameyer]

Re: "send message to Dataverse when transfer starts"; I think the second of the options mentioned in sbgrid/data-capture-module#21 would be the way to go. That would require a new Dataverse endpoint: script uses user token to notify Dataverse on the user's behalf that transfer has started (and potentially that the transfer has finished, separate from file validation).

[pdurbin]

@pameyer meh, I'm not very excited about that second option. I'll go leave a comment about this at sbgrid/data-capture-module#21 too. All this is out of scope anyway. I just thought I'd mention it. Thanks.