Accept certificate with prompt

In other parts of Gateway it will pop up with something that lets you accept the cert and add it to the trust store. Can we do that for our client too instead of making the user do it manually?

We also have a setting for adding a path to a CA, but seems reasonable to add this if the rest of Gateway is doing it.

**Edit**: `CertificateManager.getInstance().sslContext`. Should this replace the settings we have? Maybe this stuff should be managed by Gateway itself.

Start by comparing the certificate prompt and trust-store behavior used elsewhere in Gateway with the client path around CertificateManager.getInstance().sslContext. Review how the existing CA-path settings relate to that flow and determine whether Gateway or the client should own certificate management. Done means the client offers the certificate prompt and handles trust-store updates without requiring manual setup.

Scritto dal modello di indicizzazione a partire dal testo della issue.