Add optimizer hooks in callbacks

[rohitgr7]

What does this PR do?

Fixes #3657

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[codecov]

Codecov Report

Merging #4379 into master will increase coverage by 3%.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master   #4379    +/-   ##
=======================================
+ Coverage      90%     93%    +3%     
=======================================
  Files         111     111            
  Lines        8159    8044   -115     
=======================================
+ Hits         7306    7465   +159     
+ Misses        853     579   -274     

[rohitgr7]

Failing windows tests coming from master.