Refer to #211, I found that composition.dispose() inside launchSubcomposition(...) must run on the main thread. In instrumented tests, it can be run on other threads, causing crashes because Google Maps couldn't dispose correctly.

To fix this, I've set the launch command within launchSubcomposition to always run on the main thread.

You can reproduce this issue from the https://github.com/akexorcist/maps-compose-ui-test-issue

Before submitting your PR, there are a few things you can do to make sure it goes smoothly:

• Make sure to open a GitHub issue as a bug/feature request before writing your code! That way we can discuss the change, evaluate designs, and agree on the general idea
• Ensure the tests and linter pass
• Code coverage does not decrease (if any source code was changed)
• Appropriate docs were updated (if necessary)

Fixes #211 🦕