refactor: remove needless unsafe `Send` `Sync` implementations #985

Job	Run time
Rust benchmark	0s
Rust project check (ubuntu-latest)	4m 42s
Rust project check (macos-latest)	3m 49s
Rust exmaples	3m 20s
Rust fmt	22s
Rust project check (windows-latest)	10m 9s
	22m 22s

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