210 introduce GetKontentElementCodename extension method

[Sevitas]

Motivation

Which issue does this fix? Fixes #210

Checklist

• [x] Code follows coding conventions held in this repo
• [x] Automated tests have been added
• [x] Tests are passing
• [x] Docs have been updated (if applicable)
• [x] Temporary settings (e.g. variables used during development and testing) have been reverted to defaults

How to test

If manual testing is required, what are the steps?

[codecov-commenter]

Codecov Report

Merging #217 (9152b0c) into master (b07da71) will increase coverage by 81.06%. The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           master     #217       +/-   ##
===========================================
+ Coverage        0   81.06%   +81.06%     
===========================================
  Files           0      231      +231     
  Lines           0     2640     +2640     
  Branches        0      297      +297     
===========================================
+ Hits            0     2140     +2140     
- Misses          0      386      +386     
- Partials        0      114      +114     

Impacted Files	Coverage Δ
...ement/Modules/Extensions/PropertyInfoExtensions.cs	100.00% <100.00%> (ø)
...t.Ai.Management/Models/Assets/FileContentSource.cs	44.64% <0.00%> (ø)
...odels/Workflow/WorkflowPublishedStepUpsertModel.cs	100.00% <0.00%> (ø)
...Models/Types/Elements/AssetElementMetadataModel.cs	100.00% <0.00%> (ø)
...esiliencePolicy/DefaultResiliencePolicyProvider.cs	100.00% <0.00%> (ø)
...ent.Ai.Management/Exceptions/ErrorResponseModel.cs	100.00% <0.00%> (ø)
...ypes/Elements/DefaultValues/ElementDefaultValue.cs	100.00% <0.00%> (ø)
...agement/Modules/HttpClient/ManagementHttpClient.cs	78.00% <0.00%> (ø)
.../Models/Types/Patch/ContentTypeRemovePatchModel.cs	100.00% <0.00%> (ø)
... and 222 more

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