Added new Forwarded header support for Request::getClientIps

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #11073
| License       | MIT
| Doc PR        | no
Yeah sorry my initial comment was misleading I forgot that this method is called getClient**Ip** while I was lost reading the spec :)