include the json schema in convex package (#42042)

so it can be referenced from node_modules in convex.json without github deep link

e.g. convex.json `$schema: "./node_modules/convex/schemas/convex.schema.json"`

GitOrigin-RevId: 9e93c001343d871fc9c284c4321f1a1a4e67f291

Author: ianmacartney

package.json

@@ -210,6 +210,7 @@
     "react",
     "react-auth0",
     "react-clerk",
+    "schemas",
     "server",
     "src",
     "values",