feat(core): Add `content_encoding` to `MetaData` #2285

Job	Run time
lint	22s
matrix	3s
test (x86_64-unknown-linux-gnu, gcc, linux, amd64, ubuntu-latest, fs)	1m 53s
test (aarch64-apple-darwin, clang, darwin, arm64, macos-latest, fs)	1m 56s
	4m 14s

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