Adding dependency php-http/guzzle6-adapter:^2 necessary for D9, so remove compat with D10, a new major is needed

Issue #3258312: refactor to use auth0 ^7.9 using @matthewmessmer as starting point, remove old unused code

Matt's fork+branch used as a starting point can be found here https://github.com/HappySeedIndia/auth0-drupal/tree/SDK-v7

Added helper to move common methods. Cleaned up Controller. Added JS file to load lock instead of template