Support tooltip display by passing a title child element 

As explained in [this comment](https://github.com/levrik/mdi-react/issues/98#issuecomment-1293569958), `title` is not a valid `svg` attribute and will then not display a tooltip on icon hover. Setting `title` prop should instead add a `<title>` child element as follow:

```
<Icon title="my title" />
```
resulting in:
```
<svg>
    <title>{title}</title>
</svg>
```