Support aggregate transforms in facet group marks #782

Job	Run time
build-vegafusion-python-embed-linux-arm64	18m 45s
build-vegafusion-python-embed-linux-64	20m 56s
build-vegafusion-python-embed-osx-64	20m 17s
build-vegafusion-python-embed-win-64	32m 22s
build-vegafusion-wasm	10m 56s
test-rust (ubuntu-20.04)	22m 40s
check-rust	20s
test-rust (windows-2022)	40m 45s
test-rust (macos-11)	57m 8s
build-vegafusion-jupyter-packages	14m 0s
build-vegafusion-packages	2m 2s
build-vegafusion-python-embed-osx-arm64	21m 32s
build-vegafusion-server-linux-64	9m 52s
build-vegafusion-server-linux-arm64	10m 44s
build-vegafusion-server-osx-64	22m 6s
build-vegafusion-server-osx-arm64	27m 40s
build-vegafusion-server-win-64	34m 55s
test-vegafusion-python-osx-64	14m 4s
test-vegafusion-python-linux-64	6m 4s
test-vegafusion-jupyter-linux-64	29m 10s
test-vegafusion-python-win-64	9m 13s
	7h 5m 31s

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