Move builtins to snake_case #2950

Job	Run time
check-changes	20s
ran-none	0s
start-nix-linux-x86-64-tests / nix-linux-x86	1s
start-nix-linux-aarch64-cargo-build-test / nix-linux-arm64	1s
start-nix-linux-aarch64-build-default-test / nix-linux-arm64	1s
start-nix-macos-apple-silicon-tests / nix-apple-silicon	1s
start-macos-x86-64-tests / test-rust-macos-x86-64	1s
start-panic-check / improve panics	6m 46s
start-roc-benchmarks / benchmark roc programs	1s
start-ubuntu-x86-64-nix-tests-debug / cargo test debug nix	10m 48s
start-ubuntu-x86-64-tests / test zig, rust, wasm...	1s
start-windows-release-build-test / windows-release-build	10m 33s
start-windows-tests / windows-test-subset	10m 32s
ran-full	1s
finish	1s
	39m 8s

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