feat(): add option to html escape all values

Apply an additional functionaly to an interpolator being responsible for escaping interpolated params or using a sanitation service when working with them.

For the default interpolation service, the usage will be:

```javascript
// config
translationProvider.useSanitizedValues(true);
// scope
$scope.user = {link: '/user', name: '<h1>Big User</h1>'};
```

and

```html
<a href="{user.link}">{user.name}</a>
```

will results into the html

```html
<a href="/user">&lt;h1&gt;Big User&lt;/h1&gt;</a>
```