Add configurable compression

[Long9725]

Make compression pluggable and configurable (gzip level/buffer), retain API compatibility

Overview

• Introduces configurable gzip compression (level, buffer size) and a pluggable output filter factory for HTTP/1.1. Preserves the original API to maintain backward compatibility.

Changes

• CompressionConfig: add gzipLevel and gzipBufferSize with validation; add configurable noCompressionEncodings; extend useCompression to accept an encoding; restore the original useCompression(Request, Response) overload
  delegating to gzip.
• AbstractHttp11Protocol: expose getters/setters for gzip settings; add OutputFilterFactory support (by instance and by class name with error handling); delegate compression checks using the factory’s encoding; expose get/
  setNoCompressionEncodings.
• http11.filters: add OutputFilterFactory interface and default GzipOutputFilterFactory; update GzipOutputFilter to honor level and buffer size.
• Http11Processor/HTTP2 StreamProcessor: construct gzip filter using protocol-provided level/buffer settings.
• Tests: update existing tests and add coverage for gzip level/buffer, output filter factory, and no-compression encodings.
• Docs/I18N: document gzipLevel, gzipBufferSize and noCompressionEncodings in webapps/docs/config/http.xml; add related LocalStrings messages.

Influence

• Compatibility: no breaking changes; existing behavior remains default (gzip enabled per prior rules, default level -1, buffer 512).
• Extensibility: allows custom compression filters and fine-tuned gzip settings; avoids double-compression via configurable encodings.
• Risk: low; validated by added/updated unit tests.