convert setPktInfo() to SocketOption

[swhitty]

After some recent refactoring we can now get and set the packetInfo via the existing the existing protocol SocketOption / setValue() API.

UDP sockets still enable these options by default within .init() but users can now easily read and change the values like so:

let socket = try Socket(domain: AF_INET, type: .datagram)
try socket.getValue(for: .packetInfoIP) == true

try socket.setValue(false, for: .packetInfoIP)
try socket.getValue(for: .packetInfoIP) == false

Unit tests have been added to cover this case.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.16%. Comparing base (8a5f9c7) to head (a194c23).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #133      +/-   ##
==========================================
+ Coverage   90.02%   90.16%   +0.13%     
==========================================
  Files          60       60              
  Lines        3951     3946       -5     
==========================================
+ Hits         3557     3558       +1     
+ Misses        394      388       -6     

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