Add annotations to routes and apps (#866)

Adds 'annotations' attribute to Routes and Apps

api/datastore/sql/migrations/8_add_annotations_app.go

@@ -0,0 +1,27 @@
+package migrations
+
+import (
+	"context"
+
+	"github.com/fnproject/fn/api/datastore/sql/migratex"
+	"github.com/jmoiron/sqlx"
+)
+
+func up8(ctx context.Context, tx *sqlx.Tx) error {
+	_, err := tx.ExecContext(ctx, "ALTER TABLE apps ADD annotations TEXT;")
+
+	return err
+}
+
+func down8(ctx context.Context, tx *sqlx.Tx) error {
+	_, err := tx.ExecContext(ctx, "ALTER TABLE apps DROP COLUMN annotations;")
+	return err
+}
+
+func init() {
+	Migrations = append(Migrations, &migratex.MigFields{
+		VersionFunc: vfunc(8),
+		UpFunc:      up8,
+		DownFunc:    down8,
+	})
+}