Add option to extend KnownHostServerKeyVerifier handling of revoked keys

[joeljohansson99]

Description

Currently, KnownHostServerKeyVerifier does not have handle for revoked keys. It simply returns false. It would be good to abstract it to a separate function that you can override if you want to handle it in a specific way. Now you need to override acceptKnownHostEntries in order to add special handling.

Motivation

It would be a lot easier to add functionality when a revoked key matches. E.g. giving information to the user, etc.

Alternatives considered

A seperate function to log etc when a revoked key matches.
Currently overriding acceptKnownHostEntries.

Additional context

No response

[tomaswolf]

Do you want to provide a PR?

[joeljohansson99]

Sure, will do. Thanks