This PR adds support for type-switch to the rule enforce-switch-style.

As described in the associated ticket, this is motivated by a bug we found in our codebase where we missed an else clause for a type-switch. And when trying to enforce the rule via golangci-lint, we found that the type-switch was ignored nonetheless.

Further investigation revealed that Revive is currently skipping type-switches.

This is how a failure will be reported:

example.go:766:3: enforce-switch-style: switch must have a default case clause (revive)
switch v := kv.(type) {
case *dns.SVCBMandatory:
        # ...
case *dns.SVCBAlpn:
        # ...
case *dns.SVCBNoDefaultAlpn:
        # ...
case *dns.SVCBPort:

Closes #1628