Add a Requirement Panel

[ricardodalarme]

Description

Add a Requirement Panel to the package page that displays:

• Minimum Flutter Version (from the flutter version entry in pubspec.yaml)
• Minimum Dart Version (from the dart version entry in pubspec.yaml)
• Minimum Android SDK Version (from minSdkVersion in android/app/build.gradle)
• Minimum iOS Deployment Target (from IPHONEOS_DEPLOYMENT_TARGET in ios/Runner.xcodeproj/project.pbxproj)

This information should be automatically extracted from the configuration files, without requiring additional configuration from package maintainers.

Benefits

• Improves developer experience by making compatibility details easy to find.
• Ensures version information is always accurate and up to date.
• Reduces the risk of installation issues due to unsupported versions.

Example Display

Requirements:
- Flutter: ≥3.10.0
- Dart: ≥2.18.0
- Android: ≥21 (from build.gradle)
- iOS: ≥11.0 (from project.pbxproj)

[sigurdm]

I can see the value from this

We already have the flutter and dart required versions on the versions tab.

Extracting versions from build.gradle is non-trivial (because it is executable code), but we might be able to approximate it with a regex or similar. Same thing for ios (we'd probably need to look in the cocoapods/swiftpm file not the project.pbxproj).

[sigurdm]

Are there corresponding versions we could extract for the desktop platforms? Probably macos is similar to ios...