Symbols view should nest elements by their surrounding scope

[odrotbohm]

For a Spring MVC controller class like this:

@Controller
class MyController {

  @GetMapping("/path")
  void foo(@RequestParam String bar) {

  }
}

the Spring Symbols view creates multiple top-level entries:

• Controller bean
• Path mapping for /path
• @RequestParam

It would be nice if the elements were nested inside each other. The parameter annotation as a nested node underneath the method, that in turn underneath the bean etc. Otherwise (and currently) you might end up with a gazillion of @RequestParam list entries that – without that contextual information – are not really helpful on their own.