Add a `uv-python` shim executable #515

Job	Run time
linux (x86_64-unknown-linux-gnu)	2m 34s
linux (i686-unknown-linux-gnu)	2m 35s
linux-arm (aarch64-unknown-linux-gnu, aarch64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	2m 35s
linux-arm (armv7-unknown-linux-gnueabihf, armv7)	2m 35s
linux-arm (arm-unknown-linux-musleabihf, arm)	2m 38s
linux-powerpc (powerpc64le-unknown-linux-gnu, ppc64le, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	2m 33s
linux-powerpc (powerpc64-unknown-linux-gnu, ppc64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	2m 33s
linux-s390x (s390x-unknown-linux-gnu, s390x)	2m 34s
macos-aarch64	2m 35s
macos-x86_64	2m 34s
musllinux (x86_64-unknown-linux-musl)	2m 33s
musllinux (i686-unknown-linux-musl)	2m 32s
musllinux-cross (aarch64-unknown-linux-musl, aarch64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	2m 32s
sdist	2m 47s
musllinux-cross (armv7-unknown-linux-musleabihf, armv7)	2m 33s
musllinux-cross (powerpc64le-unknown-linux-musl, ppc64le, -e JEMALLOC_SYS_WITH_LG_PAGE=16, nightly)	2m 33s
windows (x86_64-pc-windows-msvc, x64)	2m 31s
windows (i686-pc-windows-msvc, x86)	2m 32s
	46m 19s

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