identical-switch-branches: exclude default

[jalaziz]

Is your feature request related to a problem? Please describe.

The identical-switch-branches rule is useful but a bit too strict.

When writing switch statements on enums from external libraries, it can be useful to handle known current values but also default a default value that matches a branch. This makes it clear what is explicitly mapped and what is a fallback value.

Describe the solution you'd like
I'd like an option to ignore default branches.

Describe alternatives you've considered
I have considered disabling the rule entirely or commenting out specific switch statements. Unfortunately, either option is undesirable as the check is still useful for other identical branch scenarios.

Additional context