refactor!: Switch to simple unsigned 64-bit integer for node IDs #674

Job	Run time
Check formatting	15s
cargo clippy+test (macOS-latest)	52s
cargo clippy+test (windows-2019)	2m 23s
cargo clippy+test (ubuntu-latest)	38s
generate-headers / Generate headers	1m 3s
	5m 11s

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