Base extension code coverage improvements

[hallvictoria]

Added extra tests for meta.py, sdkType.py, and utils.py to improve code coverage.

[codecov]

Codecov Report

Attention: Patch coverage is 99.55556% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 97.42%. Comparing base (e2bb6b1) to head (61042b6).

Files	Patch %	Lines
azure-functions-extension-base/tests/test_utils.py	99.03%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##              dev      #16       +/-   ##
===========================================
+ Coverage   82.85%   97.42%   +14.56%     
===========================================
  Files          12       13        +1     
  Lines         595      816      +221     
  Branches       95      111       +16     
===========================================
+ Hits          493      795      +302     
+ Misses         92       16       -76     
+ Partials       10        5        -5     

Flag	Coverage Δ
unittests	97.42% <99.55%> (+14.56%)	⬆️

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