Jose Alvarado grew up playing the game in Brooklyn and starred at Christ the King HS in Queens. So when he heard the ovation from the Madison Square Garden crowd when he checked in late in the first quarter in his home debut as a Knick, it hit him. “It’s different,’’ Alvarado said. “Playing for the Knicks is a huge thing, but I’m literally a kid from the same streets the fans are, and to be part of everything here, it’s a blessing. It’s something I had to get used to and to get it out of the