[feature] Add List functionality (#1802)

* start working on lists

* further list work

* test list db functions nicely

* more work on lists

* peepoopeepoo

* poke

* start list timeline func

* we're getting there lads

* couldn't be me working on stuff... could it?

* hook up handlers

* fiddling

* weeee

* woah

* screaming, pissing

* fix streaming being a whiny baby

* lint, small test fix, swagger

* tidying up, testing

* fucked! by the linter

* move timelines to state like a boss

* add timeline start to tests using state

* invalidate lists

internal/db/timeline.go

@@ -44,4 +44,8 @@ type Timeline interface {
 	//
 	// Also note the extra return values, which correspond to the nextMaxID and prevMinID for building Link headers.
 	GetFavedTimeline(ctx context.Context, accountID string, maxID string, minID string, limit int) ([]*gtsmodel.Status, string, string, Error)
+
+	// GetListTimeline returns a slice of statuses from followed accounts collected within the list with the given listID.
+	// Statuses should be returned in descending order of when they were created (newest first).
+	GetListTimeline(ctx context.Context, listID string, maxID string, sinceID string, minID string, limit int) ([]*gtsmodel.Status, error)
 }