draft of multi-tiff multi-page imaging extractor #828

Job	Run time
Full tests on ubuntu-latest with Python 3.9	43s
Full tests on windows-latest with Python 3.9	1m 40s
Full tests on macos-latest with Python 3.9	49s
Full tests on macos-13 with Python 3.9	44s
Full tests on ubuntu-latest with Python 3.10	39s
Full tests on windows-latest with Python 3.10	2m 9s
Full tests on macos-latest with Python 3.10	44s
assess-file-changes / Test changed-files	3s
Full tests on macos-13 with Python 3.10	46s
Full tests on ubuntu-latest with Python 3.11	38s
Full tests on windows-latest with Python 3.11	1m 47s
Full tests on macos-latest with Python 3.11	29s
Full tests on macos-13 with Python 3.11	1m 8s
Full tests on ubuntu-latest with Python 3.12	39s
Full tests on windows-latest with Python 3.12	1m 42s
Full tests on macos-latest with Python 3.12	31s
Full tests on macos-13 with Python 3.12	51s
Auto-detecting CHANGELOG.md updates	1s
	16m 3s

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