Repeater FormWidget: Duplicate item feature

[LukeTowers]

Discussed in https://github.com/orgs/wintercms/discussions/1394

^{Originally posted by helmutkaufmann August 2, 2025}
When I create a website, I often want to move blocks around. However, this is very limited in the current blocks implementation, basically limiting me to the reordering of blocks in a repeater.
It would be great to have copy/past functionality, that allows be to copy and paste any block to any other location within my website that accepts blocks.

[LukeTowers]

@IsaiahPaget maybe this is something that interests you. Very similar to the work already done in the translate plugin.