Replace publicroomsapi with a combination of clientapi/roomserver/currentstateserver (#1174)

* Use content_value instead of membership

* Fix build

* Replace publicroomsapi with a combination of clientapi/roomserver/currentstateserver

- All public rooms paths are now handled by clientapi
- Requests to (un)publish rooms are sent to the roomserver via `PerformPublish`
  which are stored in a new `published_table.go`
- Requests for public rooms are handled in clientapi by:
    * Fetch all room IDs which are published using `QueryPublishedRooms` on the roomserver.
    * Apply pagination parameters to the slice.
    * Do a `QueryBulkStateContent` request to the currentstateserver to pull out
      required state event *content* (not entire events).
    * Aggregate and return the chunk.

Mostly but not fully implemented (DB queries on currentstateserver are missing)

* Fix pq query

* Make postgres work

* Make sqlite work

* Fix tests

* Unbreak pagination tests

* Linting

roomserver/storage/shared/storage.go

@@ -26,6 +26,7 @@ type Database struct {
 	PrevEventsTable     tables.PreviousEvents
 	InvitesTable        tables.Invites
 	MembershipTable     tables.Membership
+	PublishedTable      tables.Published
 }
 
 func (d *Database) EventTypeNIDs(
@@ -420,6 +421,14 @@ func (d *Database) StoreEvent(
 	}, nil
 }
 
+func (d *Database) PublishRoom(ctx context.Context, roomID string, publish bool) error {
+	return d.PublishedTable.UpsertRoomPublished(ctx, roomID, publish)
+}
+
+func (d *Database) GetPublishedRooms(ctx context.Context) ([]string, error) {
+	return d.PublishedTable.SelectAllPublishedRooms(ctx, true)
+}
+
 func (d *Database) assignRoomNID(
 	ctx context.Context, txn *sql.Tx,
 	roomID string, roomVersion gomatrixserverlib.RoomVersion,