Space sync now scheduled

plug-api/silverbullet-syscall/sync.ts

@@ -11,3 +11,7 @@ export function hasInitialSyncCompleted(): Promise<boolean> {
 export function scheduleFileSync(path: string): Promise<void> {
   return syscall("sync.scheduleFileSync", path);
 }
+
+export function scheduleSpaceSync(): Promise<number> {
+  return syscall("sync.scheduleSpaceSync");
+}