plugins [google_maps_flutter] Add Groundoverlay support for Android

Adds APIs to support adding GroundOverlay to the MapView.

This PR adds a feature to Android to begin with, iOS implementation will follow.

Issues https://github.com/flutter/flutter/issues/26479

Pre-launch Checklist

[x] I read the Contributor Guide and followed the process outlined there for submitting PRs.
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[x] I signed the CLA.
[x] The title of the PR starts with the name of the plugin surrounded by square brackets, e.g. [shared_preferences]
[x] I listed at least one issue that this PR fixes in the description above.
[x] I updated pubspec.yaml with an appropriate new version according to the pub versioning philosophy.
[x] I updated CHANGELOG.md to add a description of the change.
[x] I updated/added relevant documentation (doc comments with ///).
[x] I added new tests to check the change I am making or feature I am adding, or Hixie said the PR is test exempt.
[x] All existing and new tests are passing.

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Oct 01 '21 22:10 UDAYBIDKAR

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Oct 01 '21 22:10 google-cla[bot]

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@googlebot I signed it!

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Oct 04 '21 15:10 UDAYBIDKAR

@tuemaytinh1981 Please stop spamming maps PRs with this off-topic question.

Nov 05 '21 14:11 stuartmorgan-g

Marking as a draft since this isn't fully review-ready yet.

Feb 08 '22 16:02 stuartmorgan-g

@UDAYBIDKAR Thanks for your contribution so far; are you interested in addressing the code review comments above so that we can take this PR all the way to landing?

Apr 05 '22 23:04 Hixie

Looks like @UDAYBIDKAR is unfortunately no longer around to work on this, but if anyone else would like to take this PR and run with it, please don't hesitate to step up. It looks like it's close, there's just code review comments to address.

Jun 07 '22 23:06 Hixie

Since this doesn't have an active owner, I'm going to go ahead and close it. If anyone is interested in moving forward with implementing this feature, forking this PR would be a good starting point.

Aug 30 '22 14:08 stuartmorgan-g