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This pull request introduces HTTP response compression to Alternator, allowing responses (both string and chunked) to be compressed using `gzip` or `deflate` when requested by clients and when the response size exceeds configurable thresholds. * Added new source files `http_compression.cc` and `http_compression.hh` implementing compression logic, including parsing client `Accept-Encoding` headers, selecting compression algorithms, and compressing response bodies using zlib. * Added two new configuration options to `db::config` (`alternator_response_gzip_compression_level` and `alternator_response_gzip_compression_threshold_in_bytes`) to control compression level (and optionally disable compression with level 0 - no compression) and minimum response size for compression. * Added tests showing compliance with DynamoDB behavior. Fixes #27246 New feature - no backporting Closes scylladb/scylladb#27454 * github.com:scylladb/scylladb: alternator/http_compression: Add compression of streamed response alternator/http_compression: Add implementation od gzip/deflate of string response alternator/http_compression: Add handling of Accept-Encoding header test/alternator: add tests for compressed responses