rfct(crates/lang_unicodes): migrate to opencc_rs #54

Job	Run time
Release - WASM	5m 32s
Release - FreeBSD-x86_64	2m 35s
Release - aarch64-unknown-linux-gnu	2m 43s
Release - x86_64-unknown-linux-gnu	2m 25s
Release - Linux-riscv64	4m 5s
Release - Linux-s390x	2m 42s
Release - Windows-x86_64-msvc	4m 54s
Release - Windows-x86_64-aarch64	4m 49s
Release - Windows-x86_64-gnu	8m 21s
Release - macOS-x86_64	2m 37s
Release - macOS-aarch64	2m 30s
	43m 13s

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