[RFC] Node.prototype.wrap

```js
node.wrap('try {\n', '\n}')
// identical to:
node.before('try {\n')
node.after('\n}')
```
You can wrap the node with anything, but the main use cases are blocks and call expressions.

Do we have a separate method for "block wrapping" that indents the wrapped node and implicitly adds the newline characters seen above? Or maybe passing `true` as the third argument can do that?

```js
node.wrap('try {', '}', true)
// or
node.bwrap('try {', '}')
```

Not a big fan of the name `bwrap` though.