feat: allow setting custom login-name for occ generated app password

[piepre]

Summary

added the option to set the login_name for auth-tokens created with occ

For example, this can be helpful if you want to automatically integrate CalDAV and CardDAV resources in Thunderbird. See: https://help.nextcloud.com/t/use-mailaddress-instead-of-userid-with-app-password/243247

Example

occ user:add-app-password testuser --login-name=testuser@domain.tld

[come-nc]

Apart from that, the change makes sense I think. I’m not sure about the option description, "UID" is not that clear in that context, but it’s hard to find the correct phrasing because I’m not sure it’s consistent accross Nextcloud. Maybe "the account name" works, not sure.

[github-actions]

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[piepre]

reviewed

[come-nc]

@piepre Could you rebase and squash as a single commit?

[piepre]

I really have to level up my git skills ;)