Rust

Replace `size_t` with `uint64_t` #1185

Job	Run time
feature-checks	1m 6s
tests (ubuntu-latest, x86_64-unknown-linux-gnu)	1m 14s
tests (windows-latest, x86_64-pc-windows-msvc)	1m 56s
tests (macos-14, aarch64-apple-darwin)	1m 3s
tests (macos-latest, x86_64-apple-darwin)	1m 17s
	6m 36s

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