#### What type of PR is this?
/kind feature
/area core
/area plugin
/milestone 2.13.x
#### What this PR does / why we need it:
See https://github.com/halo-dev/halo/issues/5379 for more.
This PR provides three extension points:
- FormLoginSecurityWebFilter
- AuthenticationSecurityWebFilter
- AnonymousAuthenticationSecurityWebFilter
which could be extended by plugins easily.
#### Which issue(s) this PR fixes:
Fixes https://github.com/halo-dev/halo/issues/5379
#### Special notes for your reviewer:
TBD.
#### Does this PR introduce a user-facing change?
```release-note
None
```
John Niang