WIP: initial mamba / micromamba support #359

Job	Run time
build	53s
testbed (ubuntu-latest)	6s
testbed (macos-latest)	11s
testbed (windows-latest)	12s
tests (macos-latest, 3.9, conda)	7m 6s
tests (macos-latest, 3.9, mamba)	7m 44s
tests (macos-latest, 3.9, micromamba)	2m 4s
tests (macos-latest, 3.12, conda)	7m 37s
tests (macos-latest, 3.12, mamba)	7m 59s
tests (macos-latest, 3.12, micromamba)	1m 35s
tests (ubuntu-latest, 3.9, conda)	9m 30s
tests (ubuntu-latest, 3.9, mamba)	9m 28s
tests (ubuntu-latest, 3.9, micromamba)	1m 24s
tests (ubuntu-latest, 3.12, conda)	9m 26s
tests (ubuntu-latest, 3.12, mamba)	9m 26s
tests (ubuntu-latest, 3.12, micromamba)	1m 23s
tests (windows-latest, 3.9, conda)	10m 52s
tests (windows-latest, 3.9, mamba)	11m 2s
tests (windows-latest, 3.9, micromamba)	2m 4s
tests (windows-latest, 3.12, conda)	11m 9s
tests (windows-latest, 3.12, mamba)	11m 31s
tests (windows-latest, 3.12, micromamba)	2m 19s
upload	0s
	2h 5m 1s

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