v2: Remove altair functionality from vegafusion package #954

Job	Run time
build-vegafusion-wasm	3m 28s
build-vegafusion-python-embed-linux-arm64	3m 25s
build-vegafusion-packages	1m 3s
build-vegafusion-python-embed-linux-64	2m 45s
build-vegafusion-python-embed-osx-64	12m 18s
build-vegafusion-python-embed-osx-arm64	2m 37s
build-vegafusion-python-embed-win-64	17m 43s
build-vegafusion-server-linux-64	2m 34s
build-vegafusion-server-linux-arm64	2m 2s
build-vegafusion-server-osx-64	6m 26s
build-vegafusion-server-osx-arm64	2m 27s
check-rust	3m 25s
build-vegafusion-server-win-64	19m 12s
test-rust (ubuntu-20.04)	21m 30s
test-rust (windows-2022)	37m 28s
test-rust (macos-14)	30m 25s
test-vegafusion-python-osx-arm64	5m 25s
test-vegafusion-python-linux-64	30m 55s
test-vegafusion-python-win-64	10m 58s
	3h 36m 6s

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