Support aggregate transforms in facet group marks #786

Job	Run time
build-vegafusion-jupyter-packages	17m 58s
build-vegafusion-python-embed-linux-arm64	11m 25s
build-vegafusion-packages	2m 40s
build-vegafusion-python-embed-linux-64	17m 18s
build-vegafusion-python-embed-osx-64	24m 19s
build-vegafusion-python-embed-osx-arm64	26m 12s
build-vegafusion-python-embed-win-64	21m 48s
build-vegafusion-server-linux-64	10m 1s
build-vegafusion-server-linux-arm64	10m 58s
build-vegafusion-server-osx-64	21m 56s
build-vegafusion-server-osx-arm64	22m 40s
build-vegafusion-server-win-64	29m 42s
check-rust	7m 26s
build-vegafusion-wasm	12m 12s
test-rust (ubuntu-20.04)	25m 2s
test-rust (windows-2022)	1h 12m 24s
test-rust (macos-11)	55m 46s
test-vegafusion-python-linux-64	7m 16s
test-vegafusion-jupyter-linux-64	28m 32s
test-vegafusion-python-win-64	9m 44s
test-vegafusion-python-osx-64	2m 22s
	7h 17m 41s

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