[@capacitor/google-maps] Add marker - option for clustering

## Feature Request

### Plugin
@capacitor/google-maps

### Description
Currently there is only one cluster, that can be enabled or disabled. Its not possible to exclude markers form the clustering.

Example: There could be a map with multiple bus stops that should be clustered on zoom out. Additionally there could be the buses itself with moving positions, that should not be added to the cluster.

### Platform(s)
Android
iOS
Web

### Preferred Solution
There could be an option for the addMarker method, where the developer can decide to add the marker to the cluster.