[camera_platform_interface] Adds support for video stabilization to camera_platform_interface

[ruicraveiro]

Adds support for video stabilization to camera_platform_interface.

• Adds getSupportedVideoStabilizationModes() and setVideoStabilizationMode() methods to CameraPlatform.

• Adds VideoStabilizationMode enum to represent an abstraction of the available video stabilization modes, meant for Android and iOS, mapped as follows:

/// The possible video stabilization modes that can be capturing video.
enum VideoStabilizationMode {
  /// Video stabilization is disabled.
  off,

  /// Least stabilized video stabilization mode with the least latency.
  level1,

  /// More stabilized video with more latency.
  level2,

  /// Most stabilized video with the most latency.
  level3,
}

Replace this paragraph with a description of what this PR is changing or adding, and why. Consider including before/after screenshots.

Address issue flutter/flutter#89525.
It is the camera_platform_interface sub-PR for #7108.

Pre-Review Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
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• 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.

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[gemini-code-assist]

Code Review

This pull request adds support for video stabilization to the camera_platform_interface. It introduces a VideoStabilizationMode enum, along with methods getSupportedVideoStabilizationModes and setVideoStabilizationMode in CameraPlatform. A helper method getFallbackVideoStabilizationMode is also added to handle unsupported modes. The changes are accompanied by corresponding tests. My review includes suggestions to improve code consistency by removing unnecessary async keywords and to fix a typo in the test descriptions.

[gemini-code-assist]

The async keyword is not necessary here as you are returning a value directly. You can use Future.value() to make it more concise and slightly more performant.

Suggested change

	) async => <VideoStabilizationMode>[];
	) => Future.value(<VideoStabilizationMode>[]);

[gemini-code-assist]

The async keyword is not necessary here since this method synchronously throws an error. You can remove it to be consistent with other unimplemented methods in this class, such as setZoomLevel.

Suggested change

	) async {
	throw UnimplementedError('setVideoStabilizationMode() is not implemented.');
	}
	) {
	throw UnimplementedError('setVideoStabilizationMode() is not implemented.');
	}

[gemini-code-assist]

There's a typo in the test description. It should be Video instead of View.

Suggested change

	test('getFallbackViewStabilizationMode returns level2 for mode level3', () {
	test('getFallbackVideoStabilizationMode returns level2 for mode level3', () {

[gemini-code-assist]

There's a typo in the test description. It should be Video instead of View.

Suggested change

	test('getFallbackViewStabilizationMode returns level1 for mode level2', () {
	test('getFallbackVideoStabilizationMode returns level1 for mode level2', () {

[gemini-code-assist]

There's a typo in the test description. It should be Video instead of View.

Suggested change

	test('getFallbackViewStabilizationMode returns off for mode level1', () {
	test('getFallbackVideoStabilizationMode returns off for mode level1', () {

[gemini-code-assist]

There's a typo in the test description. It should be Video instead of View.

Suggested change

	test('getFallbackViewStabilizationMode returns null for mode off', () {
	test('getFallbackVideoStabilizationMode returns null for mode off', () {