Added Support for Brotli Compression for HTTP Responses (accept-encoding: Br) #4388 (mikhail)

Why it matters

This feature enables ClickHouse server to compress HTTP responses using Brotli compression, reducing response size and improving bandwidth efficiency for clients that support it.

How to use it

Clients should include the header Accept-Encoding: br in their HTTP requests. ClickHouse will then automatically compress the responses using Brotli compression if this header is present.