Pass over credentials in archive::artifactory

[jramosf]

This change allows passing optional credentials to the archive resource from archive::artifactory.

[jramosf]

Hello @kenyon ,

You added the needs-tests label but I see #430 is already testing the password functionality of archive, and this is just passing over the parameters to that same function.

Cheers,

[Rwwn]

This doesn't work for me because the artifactory_checksum function also requires separate username/password authentication, which isn't covered in this PR. Providing the username and password still results in a forbidden error.