Support repeats in Google Sheets integration

[lognaturel]

As described in https://forum.opendatakit.org/t/repeat-groups-and-google-sheets-upload/6677.

I've labeled this as contributor friendly not because it's easy but because it's self-contained and the behavior is hopefully clear!

[grzesiek2010]

@opendatakit-bot claim

[getodk-bot]

Hello @grzesiek2010, you have been unassigned from this issue because you have not updated this issue or any referenced pull requests for over 10 days.

You can reclaim this issue or claim any other issue by commenting @opendatakit-bot claim on that issue.

Thanks for your contributions, and hope to see you again soon!

[foranastes]

What's the status of this feature?

[lognaturel]

It is complete and released. For information about releases, follow https://forum.opendatakit.org/c/releases and the features category.