Support ipnetwork

[sticnarf]

Closes #28

[Copilot]

Pull request overview

This PR adds support for the ipnetwork crate as an alternative to the existing ipnet crate dependency, addressing issue #28.

Changes:

• Refactored to support multiple IP network crate implementations via optional features
• Moved ipnet implementation to a separate module (src/ipnet.rs)
• Added new ipnetwork implementation module (src/ipnetwork.rs)
• Updated documentation examples to use doc test format
• Updated CI workflows to test with all features and maintain MSRV compatibility

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
Cargo.toml	Made both ipnet and ipnetwork optional dependencies with feature flags, default to ipnet
src/lib.rs	Refactored to conditionally include implementation modules based on feature flags, updated documentation
src/ipnet.rs	New file containing the original ipnet implementation extracted from lib.rs
src/ipnetwork.rs	New file implementing support for ipnetwork types with custom truncation logic
.github/workflows/ci.yml	Updated CI to test all features on stable and maintain MSRV testing

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[pronebird]

Amazing! Thank you!