[Feature Request] Support Direct Import of Certificates via URL

[cryptobench]

To simplify the process for requestors requiring outbound networking in their tasks, it would be helpful if providers could directly pass a URL to the import-cert command. This enhancement would allow yagna to download the certificate automatically, eliminating the need for providers to manually download and place the certificate in the correct path.

With this feature, requestors could announce a complete command including the link, enabling providers to run it immediately without extra steps.

Current Command

ya-provider rule set outbound partner import-cert root-cert-template.signed.json --mode all

Proposed Enhancement

Add support for URLs in the command:

ya-provider rule set outbound partner import-cert https://mydomain.com/root-cert-template.signed.json --mode all