* Metrics

* Dont punish late collations

* Fix metrics

* Update node/network/collator-protocol/src/lib.rs

Co-authored-by: Andronik Ordian <write@reusable.software>

* Change on_request arg to Result

Co-authored-by: Andronik Ordian <write@reusable.software>

* WIP

* The initial implementation of the collator side.

* Improve comments

* Multiple collation requests

* Add more tests and comments to validator side

* Add comments, remove dead code

* Apply suggestions from code review

Co-authored-by: Peter Goodspeed-Niklaus <coriolinus@users.noreply.github.com>

* Fix build after suggested changes

* Also connect to the next validator group

* Remove a Future impl and move TimeoutExt to util

* Minor nits

* Fix build

* Change FetchCollations back to FetchCollation

* Try this

* Final fixes

* Fix build

Co-authored-by: Peter Goodspeed-Niklaus <coriolinus@users.noreply.github.com>