* Add support for Birmingham City Council (UK), birmingham.gov.uk
* Update code logic of `birmingham_gov_uk` to reduce indentation
* Update `birmingham_gov_uk` test cases to demonstrate integer UPRN's
* Be more resilient to unknown collection types, and still return them, just with an "question mark" icon
* reformatting
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Co-authored-by: 5ila5 <5ila5@users.noreply.github.com>