[camera_avfoundation] Implementation swift migration - part 12

[RobertOdrowaz]

Migrates camera implementation as part of flutter/flutter#119109

This PR migrates the 9th chunk of FLTCam class to Swift:

• init
• Moves fields that no longer need to be accessible from FLTCam to DefaultCamera
• Removes unused textureId field from FLTCam (it seems cameraId is used as "texture id" and this field wasn't used for a while now)
• Typo correction in a comment so there is a bunch of files with just change in comment

Some properties of the FLTCam have to be temporarily made public so that they are accessible in DefaultCamera.

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 updated pubspec.yaml with an appropriate new version according to the pub versioning philosophy, or I have commented below to indicate which version change exemption this PR falls under¹.
• I updated CHANGELOG.md to add a description of the change, following repository CHANGELOG style, or I have commented below to indicate which CHANGELOG exemption 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.

If you need help, consider asking for advice on the #hackers-new channel on Discord.

Note: The Flutter team is currently trialing the use of Gemini Code Assist for GitHub. Comments from the gemini-code-assist bot should not be taken as authoritative feedback from the Flutter team. If you find its comments useful you can update your code accordingly, but if you are unsure or disagree with the feedback, please feel free to wait for a Flutter team member's review for guidance on which automated comments should be addressed.

Footnotes

1. Regular contributors who have demonstrated familiarity with the repository guidelines only need to comment if the PR is not auto-exempted by repo tooling. ↩ ↩² ↩³

[gemini-code-assist]

Code Review

This pull request continues the migration of the camera_avfoundation plugin to Swift by moving the FLTCam initialization logic into the Swift DefaultCamera class. This includes moving many properties from the Objective-C superclass to the Swift subclass, improving encapsulation. The changes are well-structured and the updates to tests and other parts of the codebase are consistent with the migration.

My review includes a few suggestions to improve maintainability and fix a potential issue in the new DefaultCamera initializer related to error handling and testability.

[stuartmorgan-g]

From triage: is this waiting on anything to be landed?

[RobertOdrowaz]

I'm on vacation ATM. I will land this once I'm back on Friday