Make keybindings accept multiple commands (macro support)

[NatoBoram]

In keybindings.json, we can add keyboard shortcuts that will perform one action. Example:

{
  "key": "ctrl+k l",
  "command": "editor.action.insertSnippet",
  "when": "editorTextFocus",
  "args": {
    "langId": "typescript",
    "name": "Log copied variable"
  }
}

However, VSCode would be much, much more powerful if one keybinding could perform multiple actions at the same time.

{
  "key": "ctrl+k l",
  "when": "editorTextFocus",
  "macro": [
    { "command": "editor.action.clipboardCopyAction" },
    { "command": "cursorEnd" },
    {
      "command": "editor.action.insertSnippet",
      "args": { "langId": "typescript", "name": "Log selected variable" }
    }
  ]
}

[ulugbekna]

Duplicate of #871