Add noise re-weight factor

[adrienball]

Description:
This PR introduces a new parameter in the LogRegIntentClassifierConfig which is named noise_reweight_factor.
This parameter allows to deviate from the default "balanced" class weight strategy by multiplying the Noise class weight by a given factor.
Typically, using noise_reweight_factor > 1 will end up in a more conservative engine, meaning that it will predict None more often, and vice versa.

Checklist:

• My PR is ready for code review
• I have added some tests, if applicable, and run the whole test suite, including linting tests
• I have updated the documentation, if applicable

[codecov-io]

Codecov Report

Merging #815 into develop will increase coverage by 0.01%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop     #815      +/-   ##
===========================================
+ Coverage    88.47%   88.48%   +0.01%     
===========================================
  Files           76       76              
  Lines         4608     4613       +5     
  Branches       894      895       +1     
===========================================
+ Hits          4077     4082       +5     
  Misses         395      395              
  Partials       136      136

[codecov-io]

Codecov Report

Merging #815 into develop will increase coverage by 0.01%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop     #815      +/-   ##
===========================================
+ Coverage    88.47%   88.48%   +0.01%     
===========================================
  Files           76       76              
  Lines         4608     4613       +5     
  Branches       894      895       +1     
===========================================
+ Hits          4077     4082       +5     
  Misses         395      395              
  Partials       136      136