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Add new holiday type "bank_holiday" and "observance" - rename official holiday to public holiday #1956

Job	Run time
build and analyse (11, ubuntu-latest)	53s
build and analyse (11, macos-latest)	1m 5s
build and analyse (11, windows-latest)	55s
build and analyse (17, ubuntu-latest)	48s
build and analyse (17, macos-latest)	1m 7s
build and analyse (17, windows-latest)	54s
build and analyse (21, ubuntu-latest)	50s
build and analyse (21, macos-latest)	1m 6s
build and analyse (21, windows-latest)	53s
	8m 31s

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