feat(core): Add `content_encoding` to `MetaData` #8149

Job	Run time
build-c-doc	16s
build-cpp-doc	17s
build-dav-server-opendalfs-doc	53s
build-fuse3-opendal-doc	43s
build-haskell-doc	10m 39s
build-java-doc	19s
build-lua-doc	12s
build-nodejs-doc	23s
build-object-store-opendal-doc	48s
build-ocaml-doc	4m 33s
build-opendal-compat-doc	45s
build-parquet-opendal-doc	47s
build-python-doc	3m 17s
build-rust-doc	3m 38s
build-unftp-sbe-opendal-doc	1m 5s
build-virtiofs-opendal-doc	51s
build-website	1m 22s
	30m 48s

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