[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/typeutils/internaltofrontend.go

@@ -1142,6 +1142,14 @@ func (c *converter) ReportToAdminAPIReport(ctx context.Context, r *gtsmodel.Repo
 	}, nil
 }
 
+func (c *converter) ListToAPIList(ctx context.Context, l *gtsmodel.List) (*apimodel.List, error) {
+	return &apimodel.List{
+		ID:            l.ID,
+		Title:         l.Title,
+		RepliesPolicy: string(l.RepliesPolicy),
+	}, nil
+}
+
 // convertAttachmentsToAPIAttachments will convert a slice of GTS model attachments to frontend API model attachments, falling back to IDs if no GTS models supplied.
 func (c *converter) convertAttachmentsToAPIAttachments(ctx context.Context, attachments []*gtsmodel.MediaAttachment, attachmentIDs []string) ([]apimodel.Attachment, error) {
 	var errs gtserror.MultiError