WIP: initial mamba / micromamba support #348

Job	Run time
build	57s
testbed (ubuntu-latest)	8s
testbed (macos-latest)	9s
testbed (windows-latest)	12s
tests (macos-latest, 3.10, conda)	1m 57s
tests (macos-latest, 3.10, mamba)	2m 59s
tests (macos-latest, 3.10, micromamba)	2m 29s
tests (macos-latest, 3.12, conda)	2m 27s
tests (macos-latest, 3.12, mamba)	2m 5s
tests (macos-latest, 3.12, micromamba)	3m 3s
tests (ubuntu-latest, 3.10, conda)	1m 52s
tests (ubuntu-latest, 3.10, mamba)	1m 49s
tests (ubuntu-latest, 3.10, micromamba)	3m 38s
tests (ubuntu-latest, 3.12, conda)	1m 55s
tests (ubuntu-latest, 3.12, mamba)	2m 5s
tests (ubuntu-latest, 3.12, micromamba)	3m 38s
tests (windows-latest, 3.10, conda)	3m 41s
tests (windows-latest, 3.10, mamba)	13m 6s
tests (windows-latest, 3.10, micromamba)	2m 12s
tests (windows-latest, 3.12, conda)	4m 13s
tests (windows-latest, 3.12, mamba)	15m 11s
tests (windows-latest, 3.12, micromamba)	2m 2s
upload	0s
	1h 11m 48s

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