Adding JS Types (#1749)

Added types for some exceptions, config objects, and sleep()

pyscript.core/src/sync.js

@@ -1,4 +1,8 @@
 export default {
+    /**
+     * 'Sleep' for the given number of seconds. Used to implement Python's time.sleep in Worker threads.
+     * @param {number} seconds The number of seconds to sleep.
+     */
     sleep(seconds) {
         return new Promise(($) => setTimeout($, seconds * 1000));
     },