network: allow multi-role phonebook entries

[algorandskiy]

Summary

1. Allowed a single phonebook entry to have multiple roles
   • P2P node can advertise both gossip and archival capabilities
   • The existing implementation did not support that but it was not an issue because (2) below
2. Moved DHT operations to meshThread from GetPeers:
   • To have all DHT ops in one place
   • To have GeetPeers be non-network query dependent
3. Updated phonebook/peerstore entries to exclude the persisted flag and move to per-role into RoleSet

Test Plan

Added unit tests for multi roles peers in phonebook and peerstore wrapper.

[codecov]

Codecov Report

Attention: Patch coverage is 91.01124% with 8 lines in your changes missing coverage. Please review.

Project coverage is 51.82%. Comparing base (ad57857) to head (947cca1).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
network/p2pNetwork.go	76.00%	4 Missing and 2 partials ⚠️
network/p2p/p2p.go	0.00%	1 Missing ⚠️
network/phonebook/phonebook.go	97.29%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6131      +/-   ##
==========================================
+ Coverage   51.77%   51.82%   +0.05%     
==========================================
  Files         644      644              
  Lines       86604    86641      +37     
==========================================
+ Hits        44840    44904      +64     
+ Misses      38893    38876      -17     
+ Partials     2871     2861      -10     

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[algorandskiy]

Implemented CR suggestions

[jannotti]

I'm ok with this. I'll wait for a little discussion about reusing the same type, but I could approve as is.

[algorandskiy]

Updated comments are requested