Adds the initial support for the marker clustering for Android, iOS and Web platforms.
Clustering is implemented using native google maps utils libraries for [Android](https://github.com/googlemaps/android-maps-utils), [iOS](https://github.com/googlemaps/google-maps-ios-utils) and [Web](https://github.com/googlemaps/js-markerclusterer).

This PR is created from previous PR: https://github.com/flutter/plugins/pull/6752

Resolves https://github.com/flutter/flutter/issues/26863

**Android**:
![image](https://github.com/flutter/packages/assets/5219613/09b84a8e-f05b-4c71-8808-4043a25201f6)

**iOS**:
![image](https://github.com/flutter/packages/assets/5219613/0859cf12-2e8c-4106-b7a7-cd4922a7dd1e)

**Web**:
![image](https://github.com/flutter/packages/assets/5219613/9269d22a-1908-4c2c-a1ab-70addb06d0f2)