Eliot Feld's KIDS DANCE, called "a New York City treasure" by The New York Times, makes its annual visit to The Joyce for 6 performances.   The remarkably poised, scrupulously schooled, and impeccably rehearsed whiz-kids, number 60, ages 11-17, will delight with Feld classics Meshugana Dance and The Jig Is Up.  Created especially for the kids are Feld's Upside Dance and the brand new Pointing, a premiere for four young ladies en pointe.   And, continuing his commitment to expanding the repertory with dances created expressly for youngsters, Feld will present two works by guest choreographers: The Wild Current by Laura Careless, and It's the Effort That Counts, a collaboration of Conner Bormann, Riley O'Flynn, and Stephanic Teresaki.