Allow to filter by squawk

[Thrasher2020]

Is your feature request related to a problem? Please describe. Ability to filter the list based on a specific squawk code - I would like to use it in conjunction with an alert that lets me know when planes squawk 7001 near me. These are normally military entering the low fly zone.

Describe the solution you'd like Add another config entry to the card to allow filtering by squawk code.

Describe alternatives you've considered Tried creating a second sensor and filtering but the end result isn't parse able by the FR24 card.

Additional context Add any other context or screenshots about the feature request here.