ENH: Add `py-rattler` #1397

Job	Run time
test_environments (ubuntu-latest)	1m 50s
test_environments (macos-latest)	1m 57s
docs	36s
test (ubuntu-latest, 3.8, release)	12m 31s
test (ubuntu-latest, 3.12, release)	12m 43s
test (ubuntu-latest, pypy-3.10, release)	14m 45s
test (macos-13, 3.8, release)	23m 52s
test (macos-13, 3.12, release)	21m 55s
test (macos-13, pypy-3.10, release)	24m 6s
	1h 54m 15s

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