CSE Machine fixes for variadic functions, closures & heap (#1645)

* CSE Machine fixes:
- make closureToJS use CSE machine instead of interpreter
- add variadic function array to heap
- handle functions from `stream`
- added heap move method

* Formatting

* Add function expression to store function name

* Add function expression and fix closureToJS

* Formatting

* Revert function expression changes, add new `declaredName` prop to closures

* Fix function name for variadic closures

* bumping version

---------

Co-authored-by: Martin Henz <[email protected]>

Author: CZX123

package.json

@@ -1,6 +1,6 @@
 {
   "name": "js-slang",
-  "version": "1.0.62",
+  "version": "1.0.63",
   "license": "Apache-2.0",
   "description": "Javascript-based implementations of Source, written in Typescript",
   "keywords": [