Add a CSSClass parameter to the Map component

[Chris-Mingay]

<div class="map-wrapper">
    <Map @ref="mapRef" MapOptions="@mapOptions" CssClass="custom-css-class"></Map>
</div>

Why?
I wanted to be able to use Tailwind CSS to define style directly to the map component.

How?
Adding a simple CssClass parameter to the Map component.