Replace arc-swap by hazarc

[wyfo]

Description

Replace arc-swap with hazarc

What does this PR do?

Replace arc-swap with hazarc

Why is this change needed?

hazarc has better performance characteristic, especially regarding loading of None and is more robustly tested.

Related Issues

None

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🏷️ Label-Based Checklist

Based on the labels applied to this PR, please complete these additional requirements:

Labels: dependencies, internal

📦 Dependency Updates

Since this PR updates dependencies:

• Changelog reviewed - Breaking changes in dependency identified and addressed
• Security advisories checked - No known vulnerabilities in new version
• License compatible - New version license is compatible with project
• Tests pass - All tests pass with new dependency versions
• Transitive deps reviewed - New transitive dependencies checked
• Version pinned appropriately - Semver range is intentional and correct
• Update scope limited - Updating one major dependency at a time when possible

Best practice: Keep dependency updates focused and test thoroughly.

🏠 Internal Change

This PR is marked as internal (not user-facing):

• No API changes - Public APIs unchanged
• No behavior changes - External behavior identical
• Refactoring/maintenance - Code improvements only
• Tests still pass - All existing tests pass without modification

Lighter review: Internal changes may have lighter review requirements.

Instructions:

1. Check off items as you complete them (change - [ ] to - [x])
2. The PR checklist CI will verify these are completed

This checklist updates automatically when labels change, but preserves your checked boxes.

[wyfo]

This was a vibe-coded experiment, but it was faster, with better result to do it by hand... Superseded by #2472

[codecov]

Codecov Report

❌ Patch coverage is 84.78261% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.53%. Comparing base (9f8dff1) to head (98eb442).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
zenoh/src/net/routing/dispatcher/face.rs	70.96%	9 Missing ⚠️
zenoh/src/net/primitives/mux.rs	76.19%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2470      +/-   ##
==========================================
- Coverage   72.60%   72.53%   -0.08%     
==========================================
  Files         390      390              
  Lines       63374    63372       -2     
==========================================
- Hits        46015    45965      -50     
- Misses      17359    17407      +48     

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