feat(SDK-4732): Implement support for Back-Channel Logout

[evansims]

Changes

This PR implements support for Back-Channel Logout.

References

See internal ticket SDK-4732.

Testing

Tests have been updated to add coverage for these new features.

Contributor Checklist

• I have read the Auth0 general contribution guidelines
• I have read the Auth0 code of conduct

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (30aafed) 100.00% compared to head (464dcae) 100.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##                main      #435   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity       523       530    +7     
===========================================
  Files             31        31           
  Lines           1294      1309   +15     
===========================================
+ Hits            1294      1309   +15     

Flag	Coverage Δ
unittestsvalidate	100.00% <100.00%> (ø)

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