19 global logging

[kjczarne]

List all Issues this Pull Request is meant to solve:

• [x] #19

Run through our contribution checklist:

• [x] Have you read kalash/doc/contributing.md?
• [x] Have you added tests for the implemented feature/fixed bug?
• [ ] Have you regenerated the JSON Schema (nox -e json_schema, only if you did anything with the data model)?
• [x] Have you ran a full test suite (nox -e test)?
• [x] Have you checked if the test coverage is at least 85%?
• [x] Have you ran code style check (flake8)?
• [ ] Have you documented the change?
• [ ] Have you updated CHANGELOG.md?

Describe shortly the changes you have introduced:

• Added a global logger that directly uses the Python logging interface, there is no need to wrap anything in my opinion. The global logger is a bit lower level since it will be predominantly used by the developers.
• Made the configuration loadable from an internal-config.yaml. At the moment configuration preload is not happening at runtime because the scope of this change was just the logger but I needed the internal config for some smart handling of defaults that can be configured as per project. Users now have more control over how the per-test-case logs are grouped and how the file logs are named.

Add additional comments (if any): The checklist is incomplete because I'll run through the rest for a number of tickets at once.

[codecov-commenter]

Codecov Report

Merging #22 (19058aa) into develop (cdd6488) will decrease coverage by 1.50%. The diff coverage is 74.16%.

@@             Coverage Diff             @@
##           develop      #22      +/-   ##
===========================================
- Coverage    76.83%   75.32%   -1.51%     
===========================================
  Files           14       15       +1     
  Lines          833      912      +79     
===========================================
+ Hits           640      687      +47     
- Misses         193      225      +32     

Impacted Files	Coverage Δ
kalash/run.py	46.46% <7.69%> (-2.74%)	:arrow_down:
kalash/filter.py	63.79% <66.66%> (ø)
kalash/interpolation.py	68.18% <68.18%> (ø)
kalash/model.py	88.52% <72.97%> (ø)
kalash/utils.py	93.33% <90.90%> (-6.67%)	:arrow_down:
kalash/collectors.py	91.66% <100.00%> (ø)
kalash/kalash_test_loader.py	89.18% <100.00%> (ø)
kalash/log.py	91.20% <100.00%> (-2.70%)	:arrow_down:
kalash/metaparser.py	92.10% <100.00%> (ø)
kalash/spec.py	97.43% <100.00%> (-2.57%)	:arrow_down:
... and 3 more

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Continue to review full report at Codecov.

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[kjczarne]

TODO:

• [ ] CLI options for the new parameters added to the CliConfig class
• [ ] Document the improvements to the logging system (global logger (dev), per-test-case loggers with more flexible configuration)
• [ ] Complete the MR checklist

[kjczarne]

This MR will partly solve #17 as well