Add a Share menu and a share vscode.dev command (#152765)

* Add a share menu
Fixes #146309

* Add vscod.dev command in github extension

* Make share menu proposed

* Add share submenu into editor context

* Add proposed to editor share menu

extensions/github/package.json

@@ -25,11 +25,18 @@
       "supported": true
     }
   },
+  "enabledApiProposals": [
+    "contribShareMenu"
+  ],
   "contributes": {
     "commands": [
       {
         "command": "github.publish",
         "title": "Publish to GitHub"
+      },
+      {
+        "command": "github.copyVscodeDevLink",
+        "title": "Copy vscode.dev Link"
       }
     ],
     "menus": {
@@ -37,6 +44,22 @@
         {
           "command": "github.publish",
           "when": "git-base.gitEnabled"
+        },
+        {
+          "command": "github.copyVscodeDevLink",
+          "when": "false"
+        }
+      ],
+      "file/share": [
+        {
+            "command": "github.copyVscodeDevLink",
+            "when": "github.hasGitHubRepo"
+        }
+      ],
+      "editor/context/share": [
+        {
+            "command": "github.copyVscodeDevLink",
+            "when": "github.hasGitHubRepo"
         }
       ]
     },