Dispute spam protection (#4134)
* Mostly notes. * Better error messages. * Introduce Fatal/NonFatal + drop back channel participation - Fatal/NonFatal - in order to make it easier to use utility functions. - We drop the back channel in dispute participation as it won't be needed any more. * Better error messages. * Utility function for receiving `CandidateEvent`s. * Ordering module typechecks. * cargo fmt * Prepare spam slots module. * Implement SpamSlots mechanism. * Implement queues. * cargo fmt * Participation. * Participation taking shape. * Finish participation. * cargo fmt * Cleanup. * WIP: Cleanup + Integration. * Make `RollingSessionWindow` initialized by default. * Make approval voting typecheck. * Get rid of lazy_static & fix approval voting tests * Move `SessionWindowSize` to node primitives. * Implement dispute coordinator initialization. * cargo fmt * Make queues return error instead of boolean. * Initialized: WIP * Introduce chain api for getting finalized block. * Fix ordering to only prune candidates on finalized events. * Pruning of old sessions in spam slots. * New import logic. * Make everything typecheck. * Fix warnings. * Get rid of obsolete dispute-participation. * Fixes. * Add back accidentelly deleted Cargo.lock * Deliver disputes in an ordered fashion. * Add module docs for errors * Use type synonym. * hidden docs. * Fix overseer tests. * Ordering provider taking `CandidateReceipt`. ... To be kicked on one next commit. * Fix ordering to use relay_parent as included block is not unique per candidate. * Add comment in ordering.rs. * Take care of duplicate entries in queues. * Better spam slots. * Review remarks + docs. * Fix db tests. * Participation tests. * Also scrape votes on first leaf for good measure. * Make tests typecheck. * Spelling. * Only participate in actual disputes, not on every import. * Don't account backing votes to spam slots. * Fix more tests. * Don't participate if we don't have keys. * Fix tests, typos and warnings. * Fix merge error. * Spelling fixes. * Add missing docs. * Queue tests. * More tests. * Add metrics + don't short circuit import. * Basic test for ordering provider. * Import fix. * Remove dead link. * One more dead link. Co-authored-by: Lldenaurois <Ljdenaurois@gmail.com>
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