[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/api/client/notifications/notificationsget.go

@@ -138,7 +138,7 @@ func (m *Module) NotificationsGETHandler(c *gin.Context) {
 		limit = int(i)
 	}
 
-	resp, errWithCode := m.processor.NotificationsGet(
+	resp, errWithCode := m.processor.Timeline().NotificationsGet(
 		c.Request.Context(),
 		authed,
 		c.Query(MaxIDKey),