feat(ios): Swift Package Manager support and iOS 13 minimum

[robert-northmind]

Description

Adds Swift Package Manager support for the iOS plugin per Flutter’s plugin author guide, while keeping CocoaPods via an updated faro.podspec.

• New ios/faro/Package.swift with FlutterFramework and Microsoft PLCrashReporter (CrashReporter product).
• Swift sources moved from ios/Classes/ to ios/faro/Sources/faro/ (Flutter’s recommended layout).
• iOS minimum deployment target: 13.0 in both podspec and SPM (aligned with the example app Podfile).
• Removed stale vendored_frameworks / preserve_paths for a missing CrashReporter.xcframework; PLCrashReporter remains the CocoaPods dependency.
• Raised pubspec.yaml environment to sdk: >=3.11.0 and flutter: >=3.41.0 (required for Flutter SPM FlutterFramework).
• Example pubspec.yaml environment aligned with the package.
• ios/.gitignore: .build/ and .swiftpm/.
• Analyzer: removed deprecated avoid_null_checks_in_equality_operators and small lint-driven fixes so flutter analyze exits 0 on current stable (CI uses analyzer exit code).
• Formatting: full-repo dart format applied so CI dart format --set-exit-if-changed . passes on stable.

Closes #189 when merged.

Related Issue(s)

Fixes #189

Type of Change

• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected) — Raises minimum Flutter/Dart and iOS deployment target; apps must use Flutter ≥ 3.41 / Dart ≥ 3.11 and target iOS ≥ 13 for the plugin’s native side.

Checklist

• Documentation updated (AGENTS.md path note; CHANGELOG.md under Unreleased)
• Tests: flutter test passed locally; iOS SPM/CocoaPods builds should be verified on macOS (pod lib lint, flutter run with SPM enabled/disabled)
• CHANGELOG.md updated

Additional Notes

• Follow-up on macOS: run pod lib lint ios/faro.podspec and an Xcode build with flutter config --enable-swift-package-manager (and with it disabled) — not runnable in this Linux CI agent.

  

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