Create config sync request

[estringana]

Description

This PR:

• Adds config_sync resquest/response
• Adds config_features response
• Make responses to be an array of messages
• Makes each message to contain the name of the message on the first field of the message array

Motivation

Additional Notes

Describe how to test your changes

Readiness checklist

• Unit tests have been updated and pass
• If known, an appropriate milestone has been selected
• All new source files include the required notice

Release checklist

• The CHANGELOG.md has been updated

[codecov-commenter]

Codecov Report

Merging #164 (de1f806) into develop/remote-config (01e3cf8) will decrease coverage by 0.17%.
The diff coverage is 56.38%.

@@                    Coverage Diff                    @@
##           develop/remote-config     #164      +/-   ##
=========================================================
- Coverage                  63.40%   63.23%   -0.18%     
=========================================================
  Files                         76       76              
  Lines                       4495     4561      +66     
  Branches                    1359     1391      +32     
=========================================================
+ Hits                        2850     2884      +34     
- Misses                       834      842       +8     
- Partials                     811      835      +24     

Flag	Coverage Δ
extension	69.22% <60.00%> (-0.06%)	⬇️
helper	54.03% <55.95%> (-0.08%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/helper/network/broker.hpp	100.00% <ø> (ø)
src/helper/client.cpp	44.55% <42.85%> (-3.24%)	⬇️
src/extension/commands_helpers.c	66.97% <60.00%> (-0.66%)	⬇️
src/helper/network/broker.cpp	43.47% <62.50%> (+3.47%)	⬆️
src/helper/network/proto.hpp	72.22% <87.50%> (+4.72%)	⬆️
src/helper/client.hpp	70.00% <100.00%> (+7.50%)	⬆️
src/helper/service.hpp	100.00% <100.00%> (ø)

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[Anilm3]

As a preliminary PR to introduce multiple responses it seems fine although I think it's quite far from a final version of this concept as we'd ideally want the message queue to be in an abstraction, perhaps in the broker, then flushed by the client somehow.