tests

[ENH] add caching action for elephant-data #908

Job	Run time
conda (3.11, macos-11)	4m 31s
conda (3.11, macos-12)	5m 3s
build-and-test-pip (3.9, ubuntu-latest)	4m 53s
build-and-test-pip (3.10, ubuntu-latest)	4m 48s
build-and-test-pip (3.11, ubuntu-latest)	4m 41s
docs (ubuntu-latest)	5m 3s
build-and-test-pip (3.12, ubuntu-latest)	5m 3s
doctests (3.10, ubuntu-latest)	1m 43s
test-conda (3.11, ubuntu-latest)	5m 3s
test-pip (3.11, windows-latest)	4m 47s
test-pip-MPI (3.9, ubuntu-latest)	5m 3s
	50m 38s

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