expose the kind of json values to simplify the retrieval Python-side

[wlav]

Adds a basic internal kind retrieval function, which greatly simplifies lookup and type conversion in the Python configuration wrapper. (Note that this method is meant to be temporary and only for the prototype. It will change once the configuration interface itself gets fleshed out.)

Edit: I saw the test coverage fail, but it's tested by the Python code which is waiting for this to be included first.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 10 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
phlex/configuration.hpp	0.00%	10 Missing ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

@@             Coverage Diff             @@
##             main     #187       +/-   ##
===========================================
+ Coverage   52.94%   80.76%   +27.81%     
===========================================
  Files         114      116        +2     
  Lines        2289     2095      -194     
  Branches     1107      332      -775     
===========================================
+ Hits         1212     1692      +480     
- Misses        237      265       +28     
+ Partials      840      138      -702     

Flag	Coverage Δ
unittests	80.76% <0.00%> (+27.81%)	⬆️

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

Files with missing lines	Coverage Δ
phlex/configuration.hpp	41.17% <0.00%> (-28.83%)	⬇️

... and 121 files with indirect coverage changes

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[knoepfel]

@wlav, do you intend to add a unit test to cover the lines that are missing code coverage?

[wlav]

The code is being used in a Python test. :)

[wlav]

I can look if there's an easy way of adding a C++ test or combine this change with the larger Python PR.

[wlav]

I tried to temporarily add a use to one if the python tests, but it didn't like that as that test is apparently not run in the CI. I'm removing this PR and will make the change part of the larger Python PR, where it is tested.