Add mock for google.maps.drawing.OverlayType

[chenmeister]

Please add support for mocking google.maps.drawing.OverlayType
https://developers.google.com/maps/documentation/javascript/reference/drawing#OverlayType

[wangela]

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@chenmeister Thank you for opening this issue. 🙏
Please check out these other resources that might help you get to a resolution in the meantime:

• Check the issue tracker - bugs and feature requests for Google Maps Platform APIs and SDKs
• Open a support case - Get 1:1 support in Cloud Console.
• Discord - chat with other developers
• StackOverflow - use the google-maps tag

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