ENH: Add `py-rattler` #1383

Job	Run time
docs	41s
test_environments (ubuntu-latest, release)	2m 29s
test (ubuntu-latest, 3.8, release)	10m 48s
test_environments (macos-latest, release)	2m 34s
test (ubuntu-latest, 3.12, release)	12m 36s
test (ubuntu-latest, pypy-3.10, release)	18m 1s
test (macos-13, 3.8, release)	20m 52s
test (macos-13, 3.12, release)	24m 6s
test (macos-13, pypy-3.10, release)	30m 43s
	2h 2m 50s

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