feat(core): Add `content_encoding` to `MetaData` #1999

Job	Run time
memory / memory / fuzz_reader	5m 55s
fs / local_fs / fuzz_reader	5m 51s
s3 / 0_minio_s3 / fuzz_reader	5m 57s
azblob / azurite_azblob / fuzz_reader	6m 8s
memory / memory / fuzz_writer	5m 45s
fs / local_fs / fuzz_writer	6m 22s
s3 / 0_minio_s3 / fuzz_writer	6m 5s
azblob / azurite_azblob / fuzz_writer	6m 12s
	48m 15s

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