feat(net): implement the address resolution network struct functions

[Green-Sky]

• implement getaddrinfo and freeaddrinfo
• do we need stocktype/protocol?
• replace all uses of getaddrinfo()
  • addr_resolve()
  • net_getipport()

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• depends on feat(net): add missing connect to network struct #2774

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This pr finally allows us to implement a regression test for #2361

Also allows fuzzing returned results from DNS.

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This pr implements a different approach to disabling DNS, compared to #2694, here we can simply replace the functions pointers in the network object with dummies/stubs.

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This change is 

[codecov]

Codecov Report

Attention: Patch coverage is 71.05263% with 22 lines in your changes missing coverage. Please review.

Project coverage is 73.21%. Comparing base (41fb183) to head (956cd08).
Report is 10 commits behind head on master.

Files with missing lines	Patch %	Lines
toxcore/network.c	72.85%	19 Missing ⚠️
toxcore/network_test_util.cc	0.00%	2 Missing ⚠️
toxcore/DHT.c	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2773      +/-   ##
==========================================
+ Coverage   72.89%   73.21%   +0.31%     
==========================================
  Files         149      149              
  Lines       30570    30595      +25     
==========================================
+ Hits        22285    22401     +116     
+ Misses       8285     8194      -91     

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