draft of multi-tiff multi-page imaging extractor #849

Job	Run time
Full tests on ubuntu-latest with Python 3.9	1m 5s
Full tests on windows-latest with Python 3.9	2m 49s
Full tests on macos-latest with Python 3.9	1m 0s
Full tests on macos-13 with Python 3.9	1m 37s
Full tests on ubuntu-latest with Python 3.10	1m 4s
Full tests on windows-latest with Python 3.10	2m 8s
Full tests on macos-latest with Python 3.10	50s
Full tests on macos-13 with Python 3.10	1m 36s
Full tests on ubuntu-latest with Python 3.11	1m 6s
assess-file-changes / Test changed-files	5s
Full tests on windows-latest with Python 3.11	2m 41s
Full tests on macos-latest with Python 3.11	47s
Full tests on macos-13 with Python 3.11	1m 30s
Full tests on ubuntu-latest with Python 3.12	1m 13s
Full tests on windows-latest with Python 3.12	3m 1s
Full tests on macos-latest with Python 3.12	1m 18s
Full tests on macos-13 with Python 3.12	1m 43s
Auto-detecting CHANGELOG.md updates	1s
	25m 34s

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