Parallelize constraint group solving #214

Job	Run time
manylinux (min) (Dockerfile.manylinux_2_28_x86_64, quay.io/pypa/manylinux_2_28_x86_64, manylinux_...	14m 29s
manylinux (min) (Dockerfile.manylinux_2_28_aarch64-min, quay.io/pypa/manylinux_2_28_aarch64, many...	15m 4s
manylinux (min) (Dockerfile.manylinux_2_28_ppc64le-min, quay.io/pypa/manylinux_2_28_ppc64le, many...	15m 3s
manylinux (min) (Dockerfile.manylinux_2_28_s390x-min, quay.io/pypa/manylinux_2_28_s390x, manylinu...	14m 32s
tracy profiler (v6.14, ON)	13m 59s
ubuntu (jammy, v6.14, linux/amd64,linux/arm64,linux/ppc64le,linux/s390x, OFF)	13m 31s
ubuntu (noble, v6.14, linux/amd64,linux/arm64,linux/ppc64le,linux/s390x, OFF)	12m 59s
ubuntu (oracular, v6.14, linux/amd64,linux/arm64,linux/ppc64le,linux/s390x, OFF)	7m 2s
manylinux	1s
	1h 46m 40s

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