Adds missing backchannel logout initiators

[kailash-b]

Changes

Please describe both what is changing and why this is important. Include:

• Adds missing Backchannel logout Initiators
• Built on top of contribution from dmarjoram Add missing backchannel logout initiators to model type. #794

References

• Auth0 Docs
• SDK-5823

Testing

• This change adds unit test coverage

• This change adds integration test coverage

• This change has been tested on the latest version of the platform/language or why not

Checklist

• I have read the Auth0 general contribution guidelines

• I have read the Auth0 Code of Conduct

• All existing and new tests complete without errors

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.85%. Comparing base (6d17b5d) to head (1868474).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #796   +/-   ##
=======================================
  Coverage   72.85%   72.85%           
=======================================
  Files         426      426           
  Lines        5526     5526           
  Branches      364      364           
=======================================
  Hits         4026     4026           
  Misses       1333     1333           
  Partials      167      167           

Flag	Coverage Δ
authIntTests	27.59% <ø> (ø)
mgmtIntTests	58.70% <ø> (ø)
unittests	3.95% <ø> (ø)

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