Add feature to enable debugging via URL param

[kmjennison]

Set the URL param tabAdsDebug=true on a page to enable debugging.

[codecov-commenter]

Codecov Report

Merging #15 into master will decrease coverage by 0.14%.
The diff coverage is 88.23%.

@@            Coverage Diff             @@
##           master      #15      +/-   ##
==========================================
- Coverage   98.41%   98.26%   -0.15%     
==========================================
  Files          29       30       +1     
  Lines         568      578      +10     
  Branches       96       96              
==========================================
+ Hits          559      568       +9     
- Misses          8        9       +1     
  Partials        1        1              

Impacted Files	Coverage Δ
src/providers/prebid/prebidBidder.js	97.61% <ø> (ø)
src/utils/logger.js	97.14% <85.71%> (ø)
src/config.js	98.00% <88.88%> (-2.00%)	⬇️
src/utils/getURL.js	100.00% <100.00%> (ø)

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