Fix: Restarting the NDP Proxy sometimes crashed

[hoh]

This is likely due because it was restarted too quickly.

Solution: Wrap the error in a custom class and retry after 5 seconds.

This is still a work in progress as a better approach should limit the frequency of restarts instead, for example using an event or queue.

[codecov]

Codecov Report

❌ Patch coverage is 20.00000% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 35.20%. Comparing base (0b93f6a) to head (71103f6).
⚠️ Report is 505 commits behind head on main.

Files with missing lines	Patch %	Lines
src/aleph/vm/network/ndp_proxy.py	20.00%	16 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #538      +/-   ##
==========================================
- Coverage   35.25%   35.20%   -0.05%     
==========================================
  Files          53       53              
  Lines        4862     4880      +18     
  Branches      577      580       +3     
==========================================
+ Hits         1714     1718       +4     
- Misses       3127     3141      +14     
  Partials       21       21              

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