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

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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

[llucenic]

Thank you for letting me know. Do you wait for my confirmation in order to merge this one into master or are there any other reasons it is not merged yet?

[denizzzka]

Reason is because maybe some necessary address data may not be public, for example, and it will be impossible to build project. And you're the only one using the inet type right now, as far as I know from your previous PR.

[llucenic]

Your approach of distinguished (templated) struct types InetAddress and CidrAddress seems to invalidate my use case. I need to perform data transformation based on the OidType of a cell value (in a result set). How should I create an appropriate generic conversion of a cell value (based on the OidType), if there are multiple structs to be used based on some flag of the very cell data?
May be, I just don't see the solution, however, after some serious consideration I am not able to adapt my code accordingly.

[denizzzka]

I need to perform data transformation based on the OidType of a cell value (in a result set). How should I create an appropriate generic conversion of a cell value (based on the OidType),

For users are available Value.oidType that can be tested before use

if there are multiple structs to be used based on some flag of the very cell data?

Strictly speaking, the internal structure is not "visible" to users. From their point of view, they are simply different types. (It just so happens that their structure is the same within the wire protocol.)