EZP-21129: Get rid of RMF\Request

*WORK IN PROGRESS*

Totally removes the requirement on `RMF\Request`. The Symfony Request is used instead, directly in Controllers.

The REST Client tests still work because they still use the old `requestParser\eZPublish` with hardcoded routes, but hasn't been refactored here.

### TODO
- [ ] Check last remains of `RMF\Request`