Add configparser package

[pjanotti]

This package will be used to implement configuration loading that will leverage config sources. This PR only includes code that was not reviewed on the core repository. This is basically the boiler-plate code needed to load config sources from the configuration file: read config sources from configuration and build them. For these, we need factory and default config settings (for the other components these are defined on core).

[codecov]

Codecov Report

Merging #295 (7ba1d58) into main (2abffd2) will decrease coverage by 0.11%.
The diff coverage is 84.88%.

@@            Coverage Diff             @@
##             main     #295      +/-   ##
==========================================
- Coverage   86.93%   86.81%   -0.12%     
==========================================
  Files          20       24       +4     
  Lines        1492     1578      +86     
==========================================
+ Hits         1297     1370      +73     
- Misses        160      173      +13     
  Partials       35       35              

Impacted Files	Coverage Δ
internal/configprovider/helpers.go	0.00% <0.00%> (ø)
internal/configprovider/settings.go	75.00% <75.00%> (ø)
internal/configprovider/builder.go	100.00% <100.00%> (ø)
internal/configprovider/parser.go	100.00% <100.00%> (ø)

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[pjanotti]

This one supersedes #277