[google_maps_flutter] Add marker clustering support - android implementation

[jokerttu]

This PR introduces support for marker clustering for Android platform

An example usabe is available in the example application at ./packages/google_maps_flutter/google_maps_flutter_android/example on the page Manage clustering

This is prequel PR for: https://github.com/flutter/packages/pull/4319 and sequel PR for: https://github.com/flutter/packages/pull/6158

Containing only changes to google_maps_flutter_android package.

Follow up PR will hold the app-facing plugin implementation.

Linked issue: https://github.com/flutter/flutter/issues/26863

Pre-launch Checklist

• [x] I read the Contributor Guide and followed the process outlined there for submitting PRs.
• [x] I read the Tree Hygiene wiki page, which explains my responsibilities.
• [x] I read and followed the relevant style guides and ran the auto-formatter. (Unlike the flutter/flutter repo, the flutter/packages repo does use dart format.)
• [x] I signed the CLA.
• [x] The title of the PR starts with the name of the package surrounded by square brackets, e.g. [shared_preferences]
• [x] I linked to 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, or this PR is exempt from version changes.
• [x] I updated CHANGELOG.md to add a description of the change, following repository CHANGELOG style.
• [x] I updated/added relevant documentation (doc comments with ///).
• [x] I added new tests to check the change I am making, or this PR is test-exempt.
• [x] All existing and new tests are passing.

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