add email and sha1 identifiers

[dfdan]

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Description

This adds support for email and sha1 identifiers.

I was interested to learn that WADM (and possibly other W3C standards) allow the sha1 of an email address as a personal identifier for a creator to allow identification without revealing email addresses.

https://www.w3.org/TR/annotation-model/#agents

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[dfdan]

I note that a new version of black (>24) has caused tests to fail on an existing line. Happy to fix the line length - or should we pin black?

[utnapischtim]

i think this PR changed the behavior with long lines in dict's.

we had the problem of different rules in newer black versions already and as i know already used the new style.

[dfdan]

This is an issue that's going to affect all packages... I'll wait and see what happens elsewhere :)
I assume this change would produce backward-compatible dicts so it might be easiest just to fix...

[utnapischtim]

i also think that the easiest would be to just fix it and adopt the new style.

[dfdan]

Done, does this otherwise seem sensible?

[utnapischtim]

yes it does, although i am not sure where you will use it.

[dfdan]

The (in my view overlooked) use case is any Invenio instance where you want to associate one or more email addresses with a creatibutor (in addition / as an alternative to ORCID, GND etc). We have instances doing this, and others have asked the question on Discord.

The email_sha1 is specifically for planned work on WADM based annotation.

The DataCite schema accepts any scheme + URI as a nameIdentifier, so these additions are compatible with DataCite.

[fenekku]

Mostly the hexadecimal thing to double-check, but otherwise LGTM.