Connectivity API: get information about links and transports through Session::info()

[milyin]

implementation for #692

• implemented transports() and links() methods
• implemented transport_events_listener() and link_events_listener() methods
• test added
• z_info example demonstrates new functionality
• adminspace uses the connectivity api, no separate implementation
• the adminspace keys @/<local_zid>/session/transport/(multicast|unicast)/<remote_zid> and @/<local_zid>/session/transport/(multicast|unicast)/<remote_zid>/link/<link_id> works as before, but uses the new API. The keeping the same adminspace behavior is ensured by test Connectivity adminspace test #2334
• the priority and reliability for Link are none if transport doesn't support qos
• the reliability is derived from the link protocol if not configured explicitly

---

🏷️ Label-Based Checklist

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

Labels: new feature

🆕 New Feature Requirements

Since this PR adds a new feature:

• Feature scope documented - Clear description of what the feature does and why it's needed
• Minimum necessary code - Implementation is as simple as possible, doesn't overcomplicate the system
• New APIs well-designed - Public APIs are intuitive, consistent with existing APIs
• Comprehensive tests - All functionality is tested (happy path + edge cases + error cases)
• Examples provided - Usage examples in code comments or separate example files
• Documentation added - New docs explaining the feature, its use cases, and API
• Feature flag considered - Can the feature be enabled/disabled for gradual rollout?
• Performance impact assessed - Memory, CPU, storage implications measured
• Integration tested - Feature works with existing features

Consider: Can this feature be split into smaller, incremental PRs?

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[codecov]

Codecov Report

❌ Patch coverage is 72.74701% with 251 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.98%. Comparing base (61f07d5) to head (97a106b).
⚠️ Report is 2 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
zenoh/src/api/info.rs	53.89%	77 Missing ⚠️
zenoh/src/api/builders/info_links.rs	57.24%	59 Missing ⚠️
zenoh/src/api/builders/info_transport.rs	67.18%	42 Missing ⚠️
zenoh/src/api/session.rs	81.48%	25 Missing ⚠️
zenoh/src/net/runtime/mod.rs	75.26%	23 Missing ⚠️
zenoh/src/api/connectivity.rs	88.88%	9 Missing ⚠️
zenoh/src/api/admin.rs	95.32%	8 Missing ⚠️
commons/zenoh-protocol/src/core/endpoint.rs	0.00%	5 Missing ⚠️
commons/zenoh-protocol/src/core/locator.rs	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2301      +/-   ##
==========================================
- Coverage   72.06%   71.98%   -0.09%     
==========================================
  Files         387      390       +3     
  Lines       62006    62729     +723     
==========================================
+ Hits        44685    45155     +470     
- Misses      17321    17574     +253     

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PR missing one of the required labels: {'breaking-change', 'internal', 'bug', 'new feature', 'documentation', 'ci', 'api-sync', 'enhancement', 'dependencies'}

[github-actions]

PR missing one of the required labels: {'new feature', 'internal', 'api-sync', 'enhancement', 'documentation', 'breaking-change', 'ci', 'dependencies', 'bug'}

[github-actions]

PR missing one of the required labels: {'internal', 'bug', 'new feature', 'breaking-change', 'dependencies', 'documentation', 'ci', 'enhancement', 'api-sync'}

[github-actions]

PR missing one of the required labels: {'enhancement', 'new feature', 'breaking-change', 'internal', 'api-sync', 'bug', 'ci', 'dependencies', 'documentation'}