[DSpace-CRIS] porting of advanced attachment and canDownload authorization features changes

[FrancescoMolinaro]

References

Relates to: DSpace/DSpace#11749
Relates to: Feature differences #12 and Feature differences #13

Description

Add new way of rendering download link in item page, the new UI component can be activated via the config:

showDownloadLinkAsAttachment

inside the layout config in default.app.config.ts.

The metadata to be visualized in the attachment box are handled with a separated config param:

advancedAttachmentRendering

Which allows granural control on which information to show in the template.

In addition a new route guard has been added for the bitstream download path, so that we can check the authorization before loading the page and handle in advance eventual authorizations needed.

On the rest side the canDownload authorization feature will be enhanced to allow authors the download of restricted items.

Instructions for Reviewers

The new config has been set as true for the time being so that every link in item page will be displayed with the new component.
The positioning was also adapted from the left side of the page to the right one, so to use the wider space for the additional informations.

List of changes in this PR:

Add new UI component and related configs
Add new guard for bitsream download path

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[tdonohue]

@FrancescoMolinaro : Same here, please specify in the PR description which DSpace-CRIS differences this PR implements/relates to.