Reduce provisioner work (#12749)

* Move create_inherent_data call to use side

* Make provide_inherent_data async

* Fix tests

* Apply suggestions from code review

Co-authored-by: Bastian Köcher <git@kchr.de>

* Log errors

* Fix test

* Fix test

* fix

* Deduplicate test code

* fix

* flag

* Update client/consensus/slots/src/lib.rs

Co-authored-by: Bastian Köcher <git@kchr.de>

* Revert "Deduplicate test code"

This reverts commit ba46adbe089329c78cd69ccdb08e27ed67bd77cf.

* Fix test

* remove commented out code

* minor to start CI run

* start CI

* Update client/consensus/slots/src/lib.rs

Co-authored-by: Marcin S. <marcin@bytedude.com>

* Apply PR suggestions

* Apply PR suggestions

* Update client/consensus/slots/src/lib.rs

Co-authored-by: Bastian Köcher <git@kchr.de>

* minor

* kickoff CI

* PR suggestions

* Compute remaining duration instead of using slot_info.duration

* Don't rely on sub implementation for Instant

* Apply PR suggestions

* Use saturating_duration_since

Co-authored-by: Bastian Köcher <git@kchr.de>
Co-authored-by: Marcin S. <marcin@bytedude.com>
Co-authored-by: parity-processbot <>