Add support for batch editing on o2m & m2m tables

[u12206050]

Added batch editing capability to list-o2m and list-m2m.

Fixes #21236

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Latest commit: 14e0efd

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[JoshTheDerf]

Ooooh, I definitely know some cases where this would be very useful.

[jeremyzilar]

Oooh, this would be incredibly helpful in our publication, where editors often need to apply a single change to a lot of different items at once. 🎉

[u12206050]

@alexchopin I see this PR is marked as still requesting changes, although all the changes have been resolved. Any reason it isn't getting merged in, its been 4months now!?