MERGER: porting creation of a custom URL for Items

[FrancescoMolinaro]

References

Related to DSpace/RestContract#318
Related to DSpace/DSpace#11549

##Description

This PR migrates the custom URL feature from DSpace-CRIS to core DSpace, allowing to define a custom url of item in submission.

##Instructions for Reviewers

The custom URL feature allows items to have human-friendly URLs instead of UUID-based paths.
To test it a rest config for the newly introduced section must be in place.

ref: DSpace/DSpace#11549 (comment)

Once the section is configured the user can provide a value for the custom url in submission.
After the item has been deposited it will be possible to access it via the custom url, e.g. /entities/person/customUrlValue

List of changes in this PR:

Adapted item resolver.
New submission section for custom url.

Additional change:

Fixed sync-i18n script (broken after latest updates on main)
Executed sync on labels.

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[github-actions]

Hi @FrancescoMolinaro,
Conflicts have been detected against the base branch.
Please resolve these conflicts as soon as you can. Thanks!

[github-actions]

Hi @FrancescoMolinaro,
Conflicts have been detected against the base branch.
Please resolve these conflicts as soon as you can. Thanks!