Rename the device, cryptography, logout and verification endpoints and the associated events/event handlers

[kevinchalet]

This PR materializes something I wanted to do for a long time: renaming some of the endpoints to be more specific or match the standard names (e.g the device authorization endpoint was initially named device endpoint in the first drafts, which is the name currently used by OpenIddict).

Here's the list of endpoints impacted by this change:

• Cryptography endpoint -> JSON Web Key Set endpoint.
• Device endpoint -> Device authorization endpoint.
• Logout endpoint -> End-session endpoint.
• Userinfo endpoint -> UserInfo endpoint.
• Verification endpoint -> End-user verification endpoint.

All the constants, builder methods, events and event handlers have been updated to use the new names.

[kevinchalet]

Note: since it's a massive change, it will need to be mentioned in the 5.x -> 6.x migration guide.