inet and cidr types support

[denizzzka]

Adds support for inet and cidr PG types, both IPv4 and IPv6 families

Also adds support of conversion from vibe.core.net.NetworkAddress

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 21 lines in your changes missing coverage. Please review.

Project coverage is 85.98%. Comparing base (f027852) to head (e8da4d3).

Files with missing lines	Patch %	Lines
src/dpq2/conv/net.d	0.00%	21 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #208      +/-   ##
==========================================
- Coverage   87.08%   85.98%   -1.10%     
==========================================
  Files          21       22       +1     
  Lines        1649     1670      +21     
==========================================
  Hits         1436     1436              
- Misses        213      234      +21     

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[denizzzka]

@llucenic I completely reworked your code related to network addresses support because wire protocol turned out to be different. It would be great if you tried this PR on your project