refactor (bindings/zig): Improvements #7856

Job	Run time
build-c-doc	30s
build-cpp-doc	28s
build-dav-server-opendalfs-doc	47s
build-fuse3-opendal-doc	53s
build-haskell-doc	3m 20s
build-java-doc	24s
build-lua-doc	12s
build-nodejs-doc	24s
build-object-store-opendal-doc	51s
build-ocaml-doc	5m 1s
build-opendal-compat-doc	48s
build-parquet-opendal-doc	47s
build-python-doc	3m 7s
build-rust-doc	4m 24s
build-unftp-sbe-opendal-doc	1m 17s
build-virtiofs-opendal-doc	46s
build-website	3m 49s
	27m 48s

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