Migrate development environment to Pixi #529

Job	Run time
codegen-clean	1m 25s
python-fmt	22s
rust-fmt-clippy	2m 55s
cargo-bundle-license	1m 15s
vl-convert-python-tests (ubuntu-latest, 3.10, bash -l {0})	9m 3s
vl-convert-rs-tests (ubuntu-latest)	9m 27s
vl-convert-python-tests (windows-2022, 3.10, pwsh)	13m 56s
vl-convert-rs-tests (windows-2022)	9m 39s
vl-convert-python-tests (macos-12, 3.10, bash -l {0})	13m 3s
vl-convert-rs-tests (macos-12)	9m 55s
	1h 11m 0s

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