Add `mapId` map init option to `agm-map` directive

Not all google.maps.Map options are included in the <agm-map> directive, it is missing a very important feature which is the mapId and this is different than the mapTypeId, it allows us to use the Google Maps API styling and Vector maps for the recently introduced WebGL features:

• https://developers.google.com/maps/documentation/javascript/styling
• https://issuetracker.google.com/issues/35821626

This is very important for our project and we would very much appreciate the inclusion of mapId in the <agm-map> component, because mapId can only be set for the map options when initializing google.maps.Map(element, options) as the setOptions({ mapId: "..."}) has no effect later as the documentation mentions,

Thank you.

[julienM77]

If it helps, I ended up migrating my project to angular 13 and using the “official” google map component, my transition didn’t require much modification https://github.com/angular/components/tree/master/src/google-maps#readme

[stale[bot]]

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