* Companion for substrate 14647

* Futher cleanup

* Apply review suggestion

Co-authored-by: Sebastian Kunert <skunert49@gmail.com>

* Apply suggestions from code review

Co-authored-by: Sebastian Kunert <skunert49@gmail.com>

* update lockfile for {"polkadot", "substrate"}

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Co-authored-by: Sebastian Kunert <skunert49@gmail.com>
Co-authored-by: parity-processbot <>

* change HashFor to HashingFor

* update lockfile for {"substrate", "polkadot"}

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Co-authored-by: parity-processbot <>

* rough draft of potential parent search

* get things compiling

* fmt

* add new function to all RelayChainInterface implementations

* fix compilation

* set slot and timestamp based on relay parent, prepare for find-parent

* skeleton of new aura logic

* fmt

* introduce a collator module in the Aura crate

* extract different implementations into own modules

* make interface more convenient

* docs and todos for lookahead

* refactor basic collator to use new collator utility

* some more refactoring

* finish most of the control flow for new aura

* introduce backend as parameter

* fix compilation

* fix a couple more TODOs

* add an `announce_block` function to collator service

* announce with barrier

* rename block announcement validator to be more specific

* fmt

* clean up unused import errors

* update references to BlockAnnounceValidator

* rename unstable_reimpl

* add AuraUnin...