[camera_android_camerax] Allow high-resolution still captures for max preset

[kalyujniy]

Updates camera_android_camerax so ResolutionPreset.max can select Camera2 high-resolution JPEG still capture sizes on Android. For ResolutionPreset.max, ImageCapture now uses ResolutionSelector.PREFER_HIGHER_RESOLUTION_OVER_CAPTURE_RATE; preview and image analysis keep the existing selector without high-resolution mode.

Fixes flutter/flutter#188310

Problem

On some Android devices, Camera2 exposes the largest 4:3 still resolution only through getHighResolutionOutputSizes(ImageFormat.JPEG). The CameraX backend used ResolutionStrategy.HIGHEST_AVAILABLE_STRATEGY without ResolutionSelector.PREFER_HIGHER_RESOLUTION_OVER_CAPTURE_RATE, so CameraX could pick the largest regular JPEG size instead.

Observed

• Camera2 regular JPEG max: 3264x2448
• Camera2 high-resolution JPEG: 4624x3468
• Flutter takePicture(): 2448x3264

After fix

• CameraX ImageCapture: 4624x3468
• Flutter takePicture(): 3468x4624

Risk / tradeoff

High-resolution still capture can be slower and use more memory. Limited to ResolutionPreset.max and ImageCapture only.

Note

Generated Pigeon files (camerax_library.g.dart, CameraXLibrary.g.kt) include formatting churn from local pigeon regeneration; functional changes are limited to ResolutionSelector allowed resolution mode and max-preset ImageCapture selector behavior.

Pre-Review Checklist

• I read the [Contributor Guide] and followed the process outlined there for submitting PRs.
• I read the [AI contribution guidelines] and understand my responsibilities, or I am not using AI tools.
• 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 under[^1].
• 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 under[^1].
• All existing and new tests are passing.

Test plan

• flutter test test/android_camera_camerax_test.dart
• dart run script/tool/bin/flutter_plugin_tools.dart format --packages camera_android_camerax --no-java --no-kotlin --no-clang-format --no-swift
• dart run script/tool/bin/flutter_plugin_tools.dart analyze --packages camera_android_camerax
• dart run script/tool/bin/flutter_plugin_tools.dart dart-test --packages camera_android_camerax
• Java: ResolutionSelectorTest
• Android native tests (native-test --android) — not run locally (no JRE); left to CI

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[gemini-code-assist]

Code Review

This pull request updates ResolutionPreset.max to support CameraX high-resolution still capture sizes on Android by introducing an allowedResolutionMode configuration to ResolutionSelector. It adds a separate _imageCaptureResolutionSelector for still image capture, allowing the camera to prefer higher resolution over capture rate. The review feedback suggests passing the preset resolution selector as an argument to _getImageCaptureResolutionSelectorFromPreset to eliminate temporal coupling and preserve existing configuration properties.