Detect change on network interface to update locators and scouting

[Hugal31]

On Unix systems, use netlink to detect added or delete IPv4 addresses to:

• Renew the interface list.
• Update the node locators.
• Restart the scouting to use the new addresses/discard the old addresses.

This is still quite hacky, with the following shortcomings:

• We do not handle IPv6 addresses, because the IPv6 addresses are "renewed" every few seconds, causing unecessary closing and re-opening of the sockets.
• We perform the locator update and the scouting reset even if the new/old addresses are not used as per the configuration.
• Only works on Linux because of the Netlink dependency.
• The code overall is not the best quality.

This would solve #1823 (with the mentioned caveats).

Feel free to close this, I opened it more for reference and I might not update it.

[github-actions]

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

[Hugal31]

A few changes:

• I did a bigger refactor to extract the scouting procedure.
• I completely ignore IPv6 changes.
• I now only open/close socket that are missing/no longer working because of the interface up/down, instead of closing and re-opening everything.

There's an additional caveat, the "reset" of the scouting routine may interrupt something important (e.g. the connection to a peer).

[codecov]

Codecov Report

Attention: Patch coverage is 52.82167% with 209 lines in your changes missing coverage. Please review.

Project coverage is 70.88%. Comparing base (b70ee93) to head (75d6d36).
Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
zenoh/src/net/runtime/scouting.rs	57.98%	129 Missing ⚠️
zenoh/src/net/runtime/mod.rs	21.42%	55 Missing ⚠️
zenoh/src/net/runtime/orchestrator.rs	61.53%	10 Missing ⚠️
zenoh/src/net/runtime/netlink.rs	70.37%	8 Missing ⚠️
commons/zenoh-util/src/net/mod.rs	41.66%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1824      +/-   ##
==========================================
- Coverage   70.95%   70.88%   -0.08%     
==========================================
  Files         364      366       +2     
  Lines       61491    61763     +272     
==========================================
+ Hits        43633    43779     +146     
- Misses      17858    17984     +126     

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[patrickelectric]

this is quite important!