Versions: add a "last modified by" field to all versions

[cboar]

It would be helpful to see which user had last modified a particular version.

I was able to patch on this functionality by adding a field to the versions/buildCollectionFields.ts file:

        {
            name: 'lastModifiedBy',
            type: 'relationship',
            relationTo: 'users',
        },

Then, set the key during versions/saveVersion.ts:

{
 // ...
 lastModifiedBy: req?.user?.id,
}

I'd be happy to work on a PR for something along these lines!

As a more general discussion, I do feel the Versions feature has been difficult to extend. Perhaps the same could be achieved via some larger configuration extension, where custom fields and hooks can work on versioned documents.

[giorgiPapava]

is it not included by default?