Issue #8769 - Introduce new Compression Handler with support for gzip, brotli, and zstandard

[joakime]

Introduces new jetty-compression libs.

• jetty-compression-common is the common location for Compression classes (neither server or client specific, just compression)
• jetty-compression-gzip is the implementation of the generic compression lib to support Content-Encoding: gzip
• jetty-compression-brotli is the implementation of the generic compression lib to support Content-Encoding: br (brotli)
• jetty-compression-zstandard is the implementation of the generic compression lib to support Content-Encoding: zstd (zstandard)
• jetty-compression-server is the implementation of the DynamicCompressionHandler (and associated Request/Response wrappers)
• jetty-compression-tests is the integration tests of features.

Fixes: #8769

[gregw]

@joakime what is the status of this? Should we be looking closer at it?