[camera] Updates min SDK to 3.29

[stuartmorgan-g]

For the camera packages:

• Updates the min SDK version to 3.29
• Runs the autoformatter with the new format
• Update code excerpts

This does not update versions because pushing format changes (even in READMEs) isn't worth doing a release that drops an SDK version (which we don't normally version)

Prep for #9816

[gemini-code-assist]

Code Review

This pull request updates the minimum SDK version for the camera packages to Flutter 3.29/Dart 3.7 and applies auto-formatting across many files. The changes are mostly consistent with the goal of updating dependencies and code style. However, there's a discrepancy between the PR title, which mentions SDK 3.27, and the actual changes that update to 3.29. It would be beneficial to align the PR title and description with the code changes. I've also left a couple of comments on duplicated lines in the changelog files that could be cleaned up.

[stuartmorgan-g]

I've also left a couple of comments on duplicated lines in the changelog files that could be cleaned up.

Oops, forgot that step on this PR. Fixed. Thanks Gemini!

[stuartmorgan-g]

Obsoleted by the combination PR.