chore: expose more flate2 feature flags

[JakubKoralewski]

zlib-ng worked better for me, so I exposed it as a feature flag

[gemini-code-assist]

Summary of Changes

Hello @JakubKoralewski, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the flexibility of the crate's compression capabilities by exposing additional feature flags related to the flate2 library. Specifically, it allows users to opt into zlib-ng backends, which can provide optimized compression and decompression performance for those who find it more suitable for their applications.

Highlights

• New Feature Flags: Introduced deflate-flate2-zlib-ng and deflate-flate2-zlib-ng-compat feature flags in Cargo.toml. These flags enable the use of zlib-ng as an alternative backend for the flate2 compression library, offering more options for compression performance.

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[gemini-code-assist]

Code Review

This pull request is a nice enhancement, exposing two new feature flags, deflate-flate2-zlib-ng and deflate-flate2-zlib-ng-compat, to allow using the zlib-ng backend from flate2. This gives users more options for performance tuning. I've added one suggestion to Cargo.toml to add comments for the new features, which will improve consistency and maintainability. Additionally, since these are new user-facing features, please consider documenting them in the README.md file's 'Features' section to help users discover and use them.