[flutter_hook_extensions] Rename from flutter_hook_config

[bdero]

Towards flutter/flutter#186299

Renames flutter_hook_config to flutter_hook_extensions. The original name is already taken on pub.dev by an unrelated placeholder package, so the first publish from #19 failed. The plural flutter_hook_extensions also reads more clearly alongside the ProtocolExtension it provides, and avoids confusion with the unrelated flutter_hooks widget package.

This is a pure rename: the package directory, pubspec name, library entrypoint, test, issue-tracker label, README, and labeler entry all move from flutter_hook_config to flutter_hook_extensions. The public API (the FlutterExtension class and config.flutter accessor) is unchanged.

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 Flutter style guide 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. [vector_math]
• 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.

[gemini-code-assist]

Code Review

This pull request renames the package flutter_hook_config to flutter_hook_extensions across all configuration files, documentation, source code, and tests. There are no review comments, and I have no feedback to provide.

[dcharkes]

@bdero If the package name you want is a package that is just being squatted, we can probably get the package name.

[dcharkes]

@mosuem owns the package name apparently. (Thanks @sigurdm!)

@mosuem could you transfer https://pub.dev/packages/flutter_hook_config package to @bdero?

[bdero]

Thanks for investigating @dcharkes. :) would be great if we can just use the flutter_hook_config name for this.

[stuartmorgan-g]

@mosuem could you transfer https://pub.dev/packages/flutter_hook_config package to @bdero?

If we do a package transfer, the easiest way to do it would be to add me as an uploader, so I can move it to the publisher.