Fix - Auth state management for ntlm auth in runner

[sandeep-singh-pstmn]

In this PR, we are storing the Auth state in a separate variable, which resets every time a new req item runs
after this chnage, we will not be able to access state data in the script, which makes sense as to why we need to expose internal state management in the script to store that in auth object

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 95.65217% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 79.13%. Comparing base (3f98974) to head (851ffa0).

Files	Patch %	Lines
lib/authorizer/auth-interface.js	87.50%	1 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1361      +/-   ##
===========================================
+ Coverage    79.09%   79.13%   +0.04%     
===========================================
  Files           45       45              
  Lines         3367     3379      +12     
  Branches       970      974       +4     
===========================================
+ Hits          2663     2674      +11     
- Misses         704      705       +1     

Flag	Coverage Δ
integration	70.55% <86.95%> (+0.04%)	⬆️
legacy	45.90% <13.04%> (-0.14%)	⬇️
unit	41.87% <56.52%> (+0.11%)	⬆️

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[coditva]

Note: This has breaking changes:

1. NTLM header and state will not be available in auth object (in pre-request script).
2. NTLM header cannot be set via the pre-request script.