feat: add is_current and profile_link methods

[Levdbas]

Related:

• Add User::profile_link() method #2682

Issue

As discussed in #2676, we could add a User::profile_link() method that get’s the link the profile admin page if a user is logged in. This is more clear than User::edit_link(), where you might assume that you get URL to edit other users.

Solution

• Add is_current method as an api method that checks if the current User object id is the same as the current (logged in) user.
• Use that method in the new profile_link method to check whether to return the profile url.

Impact

A more clear method to get the profile url for the current user and as a bonus, a way to check if we are working with the current logged in user, which comes in handy for creating extensive front-end user profiles for example.

Usage Changes

no.

Considerations

Maybe we want to cache the result of the is_current method?

Testing

Yes, tests included for both methods.