[Developer Draft] Add docs to support content resizing on iOS

[LouiseHsu]

This pr adds some docs to support dynamic content resizing for add to app scenarios.

flutter/flutter#177410

This should land after Jan 14, since the feature landed on Dec 2, according to https://sites.google.com/corp/google.com/dash/operations-hub/releases

Presubmit checklist

• If you are unwilling, or unable, to sign the CLA, even for a tiny, one-word PR, please file an issue instead of a PR.
• If this PR is not meant to land until a future stable release, mark it as draft with an explanation.
• This PR follows the Google Developer Documentation Style Guidelines—for example, it doesn't use i.e. or e.g., and it avoids I and we (first-person pronouns).
• This PR uses semantic line breaks
  of 80 characters or fewer.

[gemini-code-assist]

Summary of Changes

Hello @LouiseHsu, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the iOS 'add-to-app' documentation by providing comprehensive guidance on implementing dynamic content resizing for embedded Flutter views. It outlines the necessary steps to enable this feature, details the limitations concerning certain Flutter widgets, and offers practical code examples and a sample project to assist developers in integrating Flutter content that can adapt its size dynamically within an iOS application.

Highlights

• New Documentation Section: A new section titled 'Content Sized Views' has been added to the iOS 'add-to-app' documentation.
• Enabling Content Resizing: The documentation now includes instructions and code examples (in Swift and Objective-C) on how to enable isAutoResizable for FlutterViewController to allow embedded Flutter views to size themselves based on their content.
• Restrictions and Unsupported Widgets: Detailed information has been added regarding the restrictions of content-sized Flutter views, specifically highlighting that widgets with unbounded size (e.g., ListView) and those that defer to children for sizing (e.g., LayoutBuilder) are not supported.
• Widget Compatibility Testing: A Dart code example using UnconstrainedBox is provided to help developers test the usability of various Flutter widgets within a content-sized view context.
• Sample Project Reference: A link to a sample project demonstrating content resizing for iOS 'add-to-app' scenarios has been included for practical reference.

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[flutter-website-bot]

Visit the preview URL for this PR (updated for commit 12a618b):

https://flutter-docs-prod--pr12810-content-resizing-ha8g1duf.web.app

[gemini-code-assist]

Code Review

This PR adds documentation for supporting content resizing on iOS in add-to-app scenarios. The changes are clear and provide useful code snippets for Swift, Objective-C, and Dart. I've made a few suggestions to improve grammar, ensure consistency between code examples, and adhere to the Google Developer Documentation Style Guide.

[sfshaza2]

LGTM, once some nits are addressed.

[sfshaza2]

@LouiseHsu, can you add this to the index file? Then it can land.

[sfshaza2]

Fixing a couple typos in the URLs.

[sfshaza2]

Land once the page is added to the index file.