fix: Add DisplayName property in TestResultInfo

[codito]

• DisplayName represents the test name to be used for reporting by various loggers. Defaults to TestCaseDisplayName. Will be extensible in future: Option to publish test name as published by framework junit.testlogger#57 (comment)
• Properties collection is now adapter specific; only populated if the test was run by Nunit adapter.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (019c976) 100.00% compared to head (0ee8051) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #39   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           24        24           
  Lines          702       715   +13     
=========================================
+ Hits           702       715   +13     

Impacted Files	Coverage Δ
src/TestLogger/Core/TestResultInfo.cs	100.00% <100.00%> (ø)
src/TestLogger/Core/TestRunResultWorkflow.cs	100.00% <100.00%> (ø)
src/TestLogger/Extensions/NUnitTestAdapter.cs	100.00% <100.00%> (ø)

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