Before Hollywood, there was Brooklyn — Midwood, to be precise. On Avenue M and East 15th Street is a former movie studio that today serves two very different uses: the Shulamith School for Girls and a television production facility. The latter has been used for soap operas like “Another World” and for prime-time hits like the “Cosby Show.” The whole complex, once upon a time, was as important to the nascent American movie industry as any complex in the country.