feat: Add a config option for default initial last n.

[bgrozev]

See discussion in #2083

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a015be9) 44.23% compared to head (f3f3069) 44.25%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2095      +/-   ##
============================================
+ Coverage     44.23%   44.25%   +0.01%     
- Complexity     1927     1928       +1     
============================================
  Files           340      340              
  Lines         18823    18827       +4     
  Branches       2580     2580              
============================================
+ Hits           8327     8331       +4     
  Misses         9639     9639              
  Partials        857      857              

Files	Coverage Δ
...si/videobridge/cc/allocation/AllocationSettings.kt	76.13% <100.00%> (+1.13%)	⬆️

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