v2: Implement transforms against DataFusion DataFrame, drop custom UDFs #1007

Job	Run time
build-vegafusion-python-linux-arm64	6m 53s
build-vegafusion-python-osx-arm64	2m 28s
build-vegafusion-python-linux-64	6m 36s
build-vegafusion-python-osx-64	4m 49s
build-vegafusion-python-win-64	25m 8s
build-vegafusion-server-linux-64	2m 23s
build-vegafusion-server-osx-64	7m 28s
build-vegafusion-server-linux-arm64	5m 38s
build-vegafusion-server-osx-arm64	3m 5s
build-vegafusion-server-win-64	4m 57s
build-vegafusion-wasm	8m 4s
check-rust	7m 48s
check-vegafusion-python	2m 32s
test-rust (ubuntu-20.04)	12m 40s
test-rust (windows-2022)	19m 55s
test-rust (macos-14)	14m 59s
test-vegafusion-python-osx-arm64	1m 7s
test-vegafusion-python-linux-64	27m 6s
test-vegafusion-python-win-64	1m 56s
	2h 45m 32s

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