Current state of things:

• Tested with Pixel 3A, API 32 and works with rotation, backgrounding + resuming app, enabled + disabled impeller
• There's a bug in the example app that was introduced by 34eec78 I believe; TLDR we need to reinitialize the camera when it changes to make sure the preview is up to date

What I still would like to try:

• Test with/without Impeller on API < 29
• Test with HCPP (currently using Hybrid Composition)
• Concurrent use cases, i.e. see if this fixes [camera_android_camerax] Camera Preview is rotating 90° when starting recording with frame callback flutter#180075

Pre-Review Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I read the Tree Hygiene page, which explains my responsibilities.
• I read and followed the relevant style guides and ran the auto-formatter.
• I signed the CLA.
• The title of the PR starts with the name of the package surrounded by square brackets, e.g. [shared_preferences]
• I linked to at least one issue that this PR fixes in the description above.
• I followed the version and CHANGELOG instructions, using semantic versioning and the repository CHANGELOG style, or I have commented below to indicate which documented exception this PR falls under¹.
• I updated/added any relevant documentation (doc comments with ///).
• I added new tests to check the change I am making, or I have commented below to indicate which test exemption this PR falls under¹.
• All existing and new tests are passing.

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