[Security] Split the component into 3 sub-components Core, ACL, HTTP

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

The rationale behind this PR is to be able to use any of the sub components without requiring all the dependencies of the other sub components. Specifically, I'd like to use the core utils for an improved CSRF protection mechanism (#6554).

TODO:

- [ ] Decide what to do with the resources
- [ ] Improve the text of the README files in the sub-components (@schmittjoh could you do this?)