Flag out NaN weights in coadd & allow for weights to have different WCS than data #1286

Job	Run time
tests / Load tox environments	4s
tests / py310-test-oldestdeps (macos-latest)	4m 40s
tests / py311-test (macos-latest)	4m 56s
tests / py312-test (macos-latest)	5m 40s
tests / py310-test-oldestdeps (ubuntu-latest)	9m 34s
tests / py311-test (ubuntu-latest)	9m 9s
tests / py312-test (ubuntu-latest)	9m 53s
tests / py312-test-devdeps (ubuntu-latest)	10m 26s
tests / py310-test-oldestdeps (windows-latest)	9m 49s
tests / py311-test (windows-latest)	10m 24s
tests / py312-test (windows-latest)	10m 17s
publish / Load build targets	5s
publish / Build source distribution	6m 36s
publish / Build cp*-manylinux_x86_64 wheels	6m 36s
publish / Build cp*-manylinux_aarch64 wheels	4m 32s
publish / Build cp*-macosx_x86_64 wheels	6m 36s
publish / Build cp*-macosx_arm64 wheels	6m 36s
publish / Build cp*-win_amd64 wheels	6m 26s
publish / Upload	1s
	2h 2m 20s

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