feat: use baseUrlFunc for AuthClient

[jinlinGuan]

Add NewAuthClientWithUrlCallback function

relate: edgexfoundry/go-mod-bootstrap#804

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[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 46.15385% with 7 lines in your changes missing coverage. Please review.

Project coverage is 43.08%. Comparing base (0d481f2) to head (86fdbe0).

Files with missing lines	Patch %	Lines
clients/http/auth.go	46.15%	5 Missing and 2 partials ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #971      +/-   ##
==========================================
- Coverage   43.11%   43.08%   -0.04%     
==========================================
  Files         117      117              
  Lines        7141     7151      +10     
==========================================
+ Hits         3079     3081       +2     
- Misses       3721     3727       +6     
- Partials      341      343       +2     

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[cloudxxx8]

LGTM