Refactor blocked/parallel reprojection #421

Job	Run time
tests / Load tox environments	5s
tests / py38-test-oldestdeps (macos-latest)	11m 54s
tests / py39-test (macos-latest)	12m 1s
tests / py310-test (macos-latest)	13m 12s
tests / py38-test-oldestdeps (ubuntu-latest)	10m 4s
tests / py38-test (ubuntu-latest)	9m 16s
tests / py39-test (ubuntu-latest)	12m 0s
tests / py310-test (ubuntu-latest)	9m 59s
tests / py311-test-devdeps (ubuntu-latest)	13m 45s
tests / py38-test-oldestdeps (windows-latest)	11m 8s
tests / py39-test (windows-latest)	15m 21s
tests / py310-test (windows-latest)	18m 2s
publish / Build source distribution	5m 45s
publish / Load build targets	5s
publish / Build cp*-manylinux_x86_64 wheels	23m 5s
publish / Build cp*-manylinux_aarch64 wheels	20m 45s
publish / Build cp*-macosx_x86_64 wheels	28m 16s
publish / Build cp*-macosx_arm64 wheels	6m 2s
publish / Build cp*-win_amd64 wheels	24m 18s
publish / Upload	0s
	4h 5m 3s

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