[SidePanel API] Add sidePanel.open() cookbook (#983)

* Init commit

* Add sidepanel open cookbook

* Add minimum chrome version

* Add 116 on readme

* Add extension page
Add content script

* Tweak

* Tweak 2

* ¯\_(ツ)_/¯

* Update readme

* Update readme

* Change sample name in Readme

* Bold Chrome 116 for emphasis

* Typo fix

functional-samples/sample.sidepanel-dictionary/manifest.json

@@ -13,8 +13,5 @@
   "side_panel": {
     "default_path": "sidepanel.html"
   },
-  "permissions": [
-    "sidePanel",
-    "contextMenus"
-  ]
+  "permissions": ["sidePanel", "contextMenus"]
 }