[SDK-4719] Back-Channel Logout

[adamjmcgrath]

📋 Changes

Adding Back-Channel Logout - based on auth0/express-openid-connect#484

📎 References

https://openid.net/specs/openid-connect-backchannel-1_0.html#Backchannel
https://auth0.com/docs/authenticate/login/logout/back-channel-logout

🎯 Testing

• App router: https://github.com/adamjmcgrath/next-bcl
• App router (edge): https://github.com/adamjmcgrath/next-bcl/tree/edge
• Page router: https://github.com/adamjmcgrath/next-bcl/tree/pages

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (15a9745) 100.00% compared to head (74aaf70) 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##              main     #1590    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           62        65     +3     
  Lines         6317      6658   +341     
  Branches       500       547    +47     
==========================================
+ Hits          6317      6658   +341     

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