Improve usability for Spring Security

[jgrandja]

This issue is a major theme for next generation of Spring Security. Issues that relate to this will be added below.

• Consider introducing a new component model for authentication and authorization #13267
• Consider introducing a new authorization rules model #13277 (Related Consider Making Attribute Based Authorization Simpler to implement #13306)
• Consider redesigning the configuration model #13268
• Consider merging AuthenticationManager and AuthenticationProvider #13270
• Consider removing XML configuration support #13271
• Consider removing underused modules and APIs #13272
• Consider enabling decentralized per-module security configuration #13295
• Consider adding common scenario/pattern based security configurations #13296

[asaikali]

Added some ideas for improving usability in issue #13295 and #13296