Refactor blocked/parallel reprojection #419

Job	Run time
tests / Load tox environments	11s
tests / py38-test-oldestdeps (macos-latest)	12m 50s
tests / py39-test (macos-latest)	12m 32s
tests / py310-test (macos-latest)	13m 51s
tests / py38-test-oldestdeps (ubuntu-latest)	8m 38s
tests / py38-test (ubuntu-latest)	9m 47s
tests / py39-test (ubuntu-latest)	9m 14s
tests / py310-test (ubuntu-latest)	11m 17s
tests / py311-test-devdeps (ubuntu-latest)	12m 17s
tests / py38-test-oldestdeps (windows-latest)	12m 48s
tests / py39-test (windows-latest)	11m 51s
tests / py310-test (windows-latest)	15m 9s
publish / Build source distribution	4m 8s
publish / Load build targets	7s
publish / Build cp*-manylinux_x86_64 wheels	25m 0s
publish / Build cp*-manylinux_aarch64 wheels	14m 17s
publish / Build cp*-macosx_x86_64 wheels	26m 46s
publish / Build cp*-macosx_arm64 wheels	6m 16s
publish / Build cp*-win_amd64 wheels	21m 14s
publish / Upload	0s
	3h 48m 13s

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