* Initial federation sender -> federation API refactoring
* Move base into own package, avoids import cycle
* Fix build errors
* Fix tests
* Add signing key server tables
* Try to fold signing key server into federation API
* Fix dendritejs builds
* Update embedded interfaces
* Fix panic, fix lint error
* Update configs, docker
* Rename some things
* Reuse same keyring on the implementing side
* Fix federation tests, `NewBaseDendrite` can accept freeform options
* Fix build
* Update create_db, configs
* Name tables back
* Don't rename federationsender consumer for now
* Add notary server tables for postgres
* Add sqlite tables
* fedsender: GetServerKeys -> QueryServerKeys
As it now checks a cache and can return multiple responses
* Add mscs/hooks package, begin work for msc2836
* Flesh out hooks and add SQL schema
* Begin implementing core msc2836 logic
* Add test harness
* Linting
* Implement visibility checks; stub out APIs for tests
* Flesh out testing
* Flesh out walkThread a bit
* Persist the origin_server_ts as well
* Edges table instead of relationships
* Add nodes table for event metadata
* LEFT JOIN to extract origin_server_ts for children
* Add graph walking structs
* Implement walking algorithm
* Add more graph walking tests
* Add auto_join for local rooms
* Fix create table syntax on postgres
* Add relationship_room_id|servers to the unsigned section of events
* Persist the parent room_id/servers in edge metadata
Other events cannot assert the true room_id/servers for the
parent event, only make claims to them, hence why this is
edge metadata.
* guts to pass through room_id/servers
* Refactor msc2836 to allow handling from federation
* Add JoinedVia to PerformJoin responses
* Fix tests; review comments
