* move protocol.rs into subfolder
* add trait for mocking network behavior
* add a mock version of network ops
* remove some redundant parameters from service messages
* ensure fetching erasure chunks automatically cancels
* introduce dummy ProvideRuntimeApi
* abstract over gossip somewhat
* add mock gossip handler
* skeleton test
* remove dependence of shared table on router
* remove worker dependence on its own sender
* test shutdown
* add tests
* test that gossip streams are cleaned up correctly
* refactor worker out into its own struct and reduce bound on executor
* remove reliance of tests on global thread pool
* encode the candidate statement as only the hash
* refactor CandidateReceipt and CollationInfo
* introduce an abridged candidate receipt type
* erasure coding stores candidate receipt
* store omitted data instead and introduce AvailableData type
* refactor availability-store schema
* tweak schema and APIs a bit more
* get availability-store tests passing
* accept AbridgedCandidateReceipt in `set_heads`
* change statement type in primitives to be hash-only
* fix parachains runtime tests
* fix bad merge
* rewrite validation pipeline
* remove evaluation module
* use abridged candidate hash as canonical
* statement table uses abridged candidate receipts
* kill availability_store::Data struct
* port shared table to new validation pipelines
* extract full validation pipeline to helper
* remove old validation pipeline from collation module
* polkadot-validation compiles
* polkadot-validation tests compile
* make local collation available in validation service
* port legacy network code
* polkadot-network fully ported
* network: ensure fresh statement is propagated
* remove pov_block_hash from LocalValidationData
* remove candidate_hash field from AttestedCandidate and update runtime
* port runtimes to new ParachainHost definition
* port over polkadot-collator
* fix test compilation
* better fix
* remove unrelated validation work dispatch fix
* address grumbles
* fix equality check
* extract all network code to legacy submodule
* update references to legacy proto
* skeleton of futures-based protocol
* refactor skeleton to use background task
* rename communication_for to build_table_router
* implement internal message types for validation network
* basic ParachainNetwork and TableRouter implementations
* add some module docs
* remove exit-future from validation
* hack: adapt legacy protocol to lack of exit-future
* generalize RegisteredMessageValidator somewhat
* instantiate and teardown table routers
* clean up RouterInner drop logic
* implement most of the statement import loop
* implement statement loop in async/await
* remove unneeded TODO
* most of the collation skeleton
* send session keys and validator roles
* also send role after status
* use config in startup
* point TODO to issue
* fix test compilation
* add some more docs about statement import
* instantiate environment async
* move attestation service into subfolder
* refactor validation service architecture somewhat
* remove dependence on validation service in proposer
* fix a bunch of warnings
* improve docs
* introduce a builder for the validation service
* extract block production to its own file
* integrate new API into service
* address review grumbles
Tomasz Drwięga