Who am I? I am a television season. I fill people with hope: sponsors, network executives, advertising agencies and stockholders. Everybody but viewers. Each autumn I regenerate myself like a severed worm and try to lure millions of pairs of eyes to programs that differ little from those of previous years but which are always promoted as being new, different and exciting. Fortunately for me, the public has a short memory. This year I will flood American homes with giggle shows and girlie shows and, for the stout of mind, a few promising digressions from the standard. On CBS, there's "People," a breezy personality mag; "Kaz," a neatly rumpled drama series about a brash ex-conturned lawyer; and "Mary," Mary Tyler Moore's variety hour in Ed Sullivan's old Sunday night timeslot. On NBC, "Lifeline" will offer nonfiction hospital drama about real patients and doctors; "Dick Clark's Live Wednesday" will be the only weekly live prime time show; and "WEBB" will turn the tv biz itself into the stuff of which glitzy potboilers are made. ABC will bring back its profitable roster of goons and buffoons and add such new attractions as "Battlestar Galactiva," a souped-up outer space western. Much of the rest is silence, albeit of the crassly cacophonous sort. But you know what to expect from little old me. I am a television season. I can't please everybody, but that never stopped me before.