fix: BaseResponse import - replace wekzeug import __version__ by importlib (#573)

[Ryu-CZ]

Fix for removed wekzeug.__version__ #573 and Logical follow up to replacement of pkg_resources replacement #562 .

Design decision: I decided to create separate import function import_werkzeug_response to do not mess up with global import space with import werkzeug in case of future version conflicts. BaseResponse is now imported once within flask_restx.utils module internally with method import_werkzeug_response and accessible as flask_restx.utils.BaseResponse .

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (b7d1ded) 96.15% compared to head (b5d7b70) 96.15%.

Files	Patch %	Lines
flask_restx/utils.py	77.77%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #575   +/-   ##
=======================================
  Coverage   96.15%   96.15%           
=======================================
  Files          20       20           
  Lines        2755     2756    +1     
=======================================
+ Hits         2649     2650    +1     
  Misses        106      106           

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