Add completion and intention for named parameter comments

```php
function action($name, bool $isExternal) {
}
$foo->action('bar', <caret>);
```
At least for boolean parameters:
```php
/*isExternal:*/ true
/*isExternal:*/ false
```
Which results in:
```php
$foo->action('bar', /*isExternal:*/ true);
```
