feat: publish at least mesh_n peers

[twoeths]

Motivation

• Lodestar may want to set floodPublish as false in the future

Description

• In that case we want to publish at least mesh_n peers

see ChainSafe/lodestar#6596 (comment)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 12 lines in your changes are missing coverage. Please review.

Project coverage is 78.68%. Comparing base (ff620fd) to head (14a6c32).

❗ Current head 14a6c32 differs from pull request most recent head e43f074. Consider uploading reports for the commit e43f074 to get more accurate results

Files	Patch %	Lines
src/index.ts	0.00%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #493      +/-   ##
==========================================
- Coverage   78.79%   78.68%   -0.12%     
==========================================
  Files          46       46              
  Lines       11007    11019      +12     
  Branches     1077     1075       -2     
==========================================
- Hits         8673     8670       -3     
- Misses       2334     2349      +15     

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