Refactor: extract type ServiceBinding

[josecelano]

Refactor: extract type ServiceBinding.

It's the protocol + socket binding address for a service.

• Protocols are only: udp, http and https (protocols used by the tracker
  now).
• The port must be greater than zero (already assigned).
• Any protocol and port combination is possible. For example: http
  protocol with a port different than 80.

[codecov]

Codecov Report

Attention: Patch coverage is 94.20290% with 4 lines in your changes missing coverage. Please review.

Project coverage is 83.29%. Comparing base (7fef3e9) to head (29fa324).
Report is 3 commits behind head on develop.

Files with missing lines	Patch %	Lines
packages/primitives/src/service_binding.rs	92.30%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1423      +/-   ##
===========================================
+ Coverage    83.15%   83.29%   +0.14%     
===========================================
  Files          233      234       +1     
  Lines        17090    17147      +57     
  Branches     17090    17147      +57     
===========================================
+ Hits         14211    14283      +72     
+ Misses        2611     2593      -18     
- Partials       268      271       +3     

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[josecelano]

It's almost done. I only have to fix two tests because the service URL and the service check URL are not the same.

[josecelano]

ACK 29fa324