This pr changes how the runtime api subsystem processes runtime api
requests. Instead of answering all of them in the subsystem task and
thus, making all requests sequential, we now answer them in a background
task. This enables us to serve multiple requests at once.
* drop in tracing to replace log
* add structured logging to trace messages
* add structured logging to debug messages
* add structured logging to info messages
* add structured logging to warn messages
* add structured logging to error messages
* normalize spacing and Display vs Debug
* add instrumentation to the various 'fn run'
* use explicit tracing module throughout
* fix availability distribution test
* don't double-print errors
* remove further redundancy from logs
* fix test errors
* fix more test errors
* remove unused kv_log_macro
* fix unused variable
* add tracing spans to collation generation
* add tracing spans to av-store
* add tracing spans to backing
* add tracing spans to bitfield-signing
* add tracing spans to candidate-selection
* add tracing spans to candidate-validation
* add tracing spans to chain-api
* add tracing spans to provisioner
* add tracing spans to runtime-api
* add tracing spans to availability-distribution
* add tracing spans to bitfield-distribution
* add tracing spans to network-bridge
* add tracing spans to collator-protocol
* add tracing spans to pov-distribution
* add tracing spans to statement-distribution
* add tracing spans to overseer
* cleanup
* type defaults for ParachainHost
* add ValidationCode message
* implement core loop of runtime API subsystem
* subsystem trait implementation for runtime API subsystem
* implement a mock runtime API
* some tests that ensure requests are forwarded to runtime API correctly
* fix dependency grumbles
* improve RuntimeApiError API
* create a README on Runtime APIs
* add ParaId type
* write up runtime APIs
* more preamble
* rename
* rejig runtime APIs
* add occupied_since to `BlockNumber`
* skeleton crate for runtime API subsystem
* improve group_for_core
* improve docs on availability cores runtime API
* guide: freed -> free
* add primitives for runtime APIs
* create a v1 ParachainHost API trait
* guide: make validation code return `Option`al.
* skeleton runtime API helpers
* make parachain-host runtime-generic
* skeleton for most runtime API implementation functions
* guide: add runtime API helper methods
* implement new helpers of the inclusion module
* guide: remove retries check, as it is unneeded
* implement helpers for scheduler module for Runtime APIs
* clean up `validator_groups` implementation
* implement next_rotation_at and last_rotation_at
* guide: more helpers on GroupRotationInfo
* almost finish implementing runtime APIs
* add explicit block parameter to runtime API fns
* guide: generalize number parameter
* guide: add group_responsible to occupied-core
* update primitives due to guide changes
* finishing touches on runtime API implementation; squash warnings
* break out runtime API impl to separate file
* add tests for next_up logic
* test group rotation info
* point to filed TODO
* remove unused TODO [now]
* indentation
* guide: para -> para_id
* rename para field to para_id for core meta
* remove reference to outdated AvailabilityCores type
* add an event in `inclusion` for candidates being included or timing out
* guide: candidate events
* guide: adjust language
* Candidate events type from guide and adjust inclusion event
* implement `candidate_events` runtime API
* fix runtime test compilation
* max -> min
* fix typos
* guide: add `RuntimeAPIRequest::CandidateEvents`
Bastian Köcher