It used to be common for Asian Americans in Hollywood to joke about the “rule of one” — the unwritten law that historically seemed to limit every ensemble cast to just one Asian actor; all of network TV to just one Asian TV show; every film season to just one Asian movie. But over the past 12 months, we’ve seen a remarkable string of critically acclaimed and commercially successful movies created by and starring Asian Americans, beginning with “Crazy Rich Asians,” continuing with “To All the Boys I’ve Loved Before” and “Searching” — and now hitting a new gear with Netflix’s delightful new Ali Wong/Randall Park comedy, “Always Be My Maybe.”