[jsroot] support old jupyter lab code

There sequence of parse, settings and draw calls was used.
Now these functions provided in JSRoot.core.js to correctly work.
After final v7 JSROOT release jupyter lab code will be adjusted

js/scripts/JSRoot.core.js

@@ -60,6 +60,35 @@ exports.openFile = function(...args) {
    return _sync().then(() => import('../modules/io.mjs')).then(handle => handle.openFile(...args));
 }
 
+exports.parse = function(json) {
+   if (typeof json == 'string')
+      json = JSON.parse(json);
+
+   if (json && typeof json == 'object')
+      json.$parse_workaround = true;
+   return json;
+}
+
+function test_parse_workaround(obj) {
+   if (obj && (typeof obj == 'object') && obj.$parse_workaround) {
+      delete obj.$parse_workaround;
+      if (JSROOT?.parse)
+         obj = JSROOT.parse(obj);
+   }
+   return obj;
+}
+
+exports.draw = function(dom, obj, opt) {
+   return _sync().then(() => import('../modules/draw.mjs')).then(handle => handle.draw(dom, test_parse_workaround(obj), opt));
+}
+
+exports.redraw = function(dom, obj, opt) {
+   return _sync().then(() => import('../modules/draw.mjs')).then(handle => handle.redraw(dom, test_parse_workaround(obj), opt));
+}
+
+let workaround_settings = {};
+
+exports.settings = workaround_settings;
 
 /** @summary Old v6 method to load JSROOT functionality
   * @desc
@@ -294,11 +323,13 @@ if ((typeof globalThis !== "undefined") && !globalThis.JSROOT) {
    globalThis.JSROOT._complete_loading = _sync;
 
    let pr = Promise.all([import('../modules/core.mjs'), import('../modules/draw.mjs'), import('../modules/gui/HierarchyPainter.mjs')]).then(arr => {
-      Object.assign(globalThis.JSROOT, arr[0], arr[1]);
+
+      Object.assign(globalThis.JSROOT, arr[0], arr[1], arr[2]);
+
+      Object.assign(globalThis.JSROOT.settings, workaround_settings);
 
       globalThis.JSROOT._ = arr[0].internals;
 
-      globalThis.JSROOT.HierarchyPainter = arr[2].HierarchyPainter;
       getHPainter = arr[2].getHPainter;
 
       globalThis.JSROOT.hpainter = getHPainter();