[googlemaps] - zoomChanged -> zoom_changed

[AerisG222]

When using "@angular/google-maps": "^9.0.0-rc.0", the zoomChanged event never fires.

Currently, google-map.ts:222 reads as follows:

@output() zoomChanged: Observable = this._eventManager.getLazyEmitter('zoomChanged');

However, based on the related google docs (which is nicely commented on line 220: https://developers.google.com/maps/documentation/javascript/reference/map#Map.zoom_changed) it looks like the event name should be "zoom_changed" rather than "zoomChanged".

[crisbeto]

Sorry about that, it looks like I messed up the name when I was redoing the way events are managed in #17845. This'll be fixed by #18027.

[AerisG222]

No worries - thanks for all the work you have put into this!

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