A kinder, gentler action hero for the New Age, Jason Scott Lee may be Hollywood's first male Asian-American sex symbol. (Another contender, Bruce Lee, first achieved superstardom in Hong Kong but failed to live long enough to cross over from chop-socky flicks.) Athletic and handsome, the young Chinese-Hawaiian actor's somewhat ethnically indeterminate looks led to a variety of roles in films and TV before he gained international celebrity as the star of the biopic "Dragon: The Bruce Lee Story" (1993). Though possessing little physical resemblance to the kung fu legend and no prior martial arts