ENH: Add `py-rattler` #1392

Job	Run time
test_environments (ubuntu-latest, release)	2m 29s
test_environments (macos-latest, release)	2m 43s
docs	35s
test (ubuntu-latest, 3.8, release)	11m 59s
test (ubuntu-latest, 3.12, release)	12m 46s
test (ubuntu-latest, pypy-3.10, release)	16m 15s
test (macos-13, 3.8, release)	25m 15s
test (macos-13, 3.12, release)	28m 10s
test (macos-13, pypy-3.10, release)	28m 30s
	2h 8m 42s

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