Config option to exclude URLs from verbose middleware logging

[pacoguzman]

Add configurable option to exclude URLs from verbose middleware logging

Description

We added MiddlewareVerboseLoggerExcludeURLs env where excluded urls can be specified as a list of string comma separated. We configure the middleware logging with this configuration setting.

Motivation and Context

Currently we have integrated Flagr on our infrastructure and we wanted to remove logging entries for not relevant urls like health check or metrics. So we can focus on relevant ones.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov-commenter]

Codecov Report

Merging #375 into master will decrease coverage by 0.09%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master     #375      +/-   ##
==========================================
- Coverage   81.80%   81.70%   -0.10%     
==========================================
  Files          26       26              
  Lines        1533     1536       +3     
==========================================
+ Hits         1254     1255       +1     
- Misses        210      211       +1     
- Partials       69       70       +1     

Impacted Files	Coverage Δ
pkg/config/middleware.go	63.50% <50.00%> (-0.68%)	⬇️

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