ptp virtual clock

[cmeissl]

On linux we can virtualize a single hardware ptp clock.
One possible use case for this is to synchronize multiple clock domains on the same interface.
As the real hardware clock will be left free running, we need to specify the index of the virtual clock to receive the correct hardware timestamps at socket creation time.

depends on pendulum-project/timestamped-socket#30

[codecov]

Codecov Report

Attention: Patch coverage is 6.25000% with 15 lines in your changes are missing coverage. Please review.

Project coverage is 62.64%. Comparing base (8fd3820) to head (e78ebac).
Report is 50 commits behind head on main.

Files	Patch %	Lines
statime-linux/src/socket.rs	0.00%	8 Missing ⚠️
statime-linux/src/main.rs	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #418      +/-   ##
==========================================
+ Coverage   62.05%   62.64%   +0.58%     
==========================================
  Files          55       62       +7     
  Lines        6903     7677     +774     
==========================================
+ Hits         4284     4809     +525     
- Misses       2619     2868     +249     

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[davidv1992]

@cmeissl we have merged a slightly different approach to supporting this in statime in PR #457. Does that approach work for you?