remove SocketAddress.make(from:) protocol

[swhitty]

Remove SocketAddress.make(from:) from protocol and instead place the methods on the 3 address types;

• sockaddr_in
• sockaddr_in6
• sockaddr_un

Other conformers cannot be converted from sockaddr_storage using the current methods so it makes sense to have the compiler enforce this.

Updates sockaddr_strorage.withSockAddr { } to pass the underlying address size, not the storage size.

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.57%. Comparing base (f9d9a18) to head (fc1160d).
⚠️ Report is 3 commits behind head on swift5.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
FlyingSocks/Sources/SocketAddress.swift	50.00%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           swift5     #185      +/-   ##
==========================================
- Coverage   92.80%   92.57%   -0.24%     
==========================================
  Files          69       69              
  Lines        3446     3460      +14     
==========================================
+ Hits         3198     3203       +5     
- Misses        248      257       +9     

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