support to add additional ad load listeners

[anirudhramanan]

No description provided.

[codecov-commenter]

Codecov Report

Merging #14 into master will increase coverage by 2.58%.
The diff coverage is 77.77%.

@@            Coverage Diff             @@
##           master      #14      +/-   ##
==========================================
+ Coverage   67.01%   69.59%   +2.58%     
==========================================
  Files          67       67              
  Lines        1455     1457       +2     
  Branches      250      250              
==========================================
+ Hits          975     1014      +39     
+ Misses        310      265      -45     
- Partials      170      178       +8     

Impacted Files	Coverage Δ
madman/src/main/java/com/flipkart/madman/Madman.kt	66.07% <77.77%> (+66.07%)	⬆️
...main/java/com/flipkart/madman/helper/Assertions.kt	25.00% <0.00%> (ø)
...ava/com/flipkart/madman/logger/DebugLevelLogger.kt	100.00% <0.00%> (+100.00%)	⬆️