Set max network number to 8000 instead of 8192

[Andrew-Dickinson]

The docs and configen say the max number is 8000 and we should be consistent with that

Also enforces minimum and maximum NN at node creation time

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.88%. Comparing base (8feaa16) to head (f8fa204).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #803   +/-   ##
=======================================
  Coverage   94.88%   94.88%           
=======================================
  Files          89       89           
  Lines        3809     3812    +3     
=======================================
+ Hits         3614     3617    +3     
  Misses        195      195           

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[WillNilges]

If MeshDB can support it, why not update docs/configgen/etc and take advantage of the extra NNs?