Firewall: Rules: Interface: Facilitate checking by showing only 'in' or 'out' firewall rules of an interface

[sja1440]

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

I make extensive use of both firewall groups and tags. I always validate by eye my rules to minimise errors. I find a useful way to check is to use the GUI Firewall: Rules: Interface and then expand the Group provided rules section (I do not use custom floating rules). This certainly shows all rules but interleaves the various group's "in" and "out" rules making it really hard to easily understand what happen for connections going in a certain direction.

Describe the solution you like

I would like to see an option on the GUI which allows me to only see, for example, the "in" rules by hiding all the "out" rules. And vice versa.

I believe that this a GUI only change with no impact on the way pf is used.

Describe alternatives you considered
I see no other alternative.

Additional context
None