chore: add xtask to download regression tests #335

Job	Run time
pre_job	6s
windows (windows-latest, x86)	3m 8s
windows (windows-latest, x64)	3m 8s
linux (ubuntu-latest, x86_64, yum install clang llvm llvm-devel -y && python3 -m ensurepip, manyl...	2m 27s
macos (macos-14, aarch64)	58s
linux (ubuntu-latest, aarch64-unknown-linux-gnu, --zig, python3 -m pip install ziglang==0.11.0 )	2m 13s
macos (macos-14, x86_64)	1m 0s
sdist	28s
Release	0s
	13m 28s

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