Add SPM support

[fotiDim]

Addresses #169

[gemini-code-assist]

Code Review

This pull request migrates the Darwin implementation to support Swift Package Manager (SPM) by adding a Package.swift file and reorganizing source files into a standard SPM structure. It removes CocoaPods dependencies from the example projects, updates Xcode project configurations to integrate the new SPM-based plugin package, and bumps the minimum Flutter and Dart SDK versions. Additionally, the iOS AppDelegate was updated to support the FlutterImplicitEngineDelegate for plugin registration. I have no feedback to provide.

[Copilot]

Pull request overview

Adds Swift Package Manager (SPM) support for the Darwin (iOS/macOS) side of the universal_ble Flutter plugin, along with example app project updates to use SwiftPM-generated plugin packages instead of CocoaPods.

Changes:

• Raise Dart/Flutter minimum SDK constraints and update example lockfile accordingly.
• Introduce a SwiftPM package for the Darwin plugin sources and relocate/generated Pigeon Swift output into the SwiftPM target.
• Update iOS/macOS example Xcode projects/schemes to run Flutter “prepare” steps and remove CocoaPods integration artifacts (Podfiles, xcconfig includes, Pods frameworks).

Reviewed changes

Copilot reviewed 18 out of 28 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
pubspec.yaml	Bumps Dart/Flutter SDK minimums.
pigeon/universal_ble.dart	Updates Pigeon swiftOut path to SwiftPM target sources.
example/pubspec.lock	Updates resolved deps and SDK constraints for the example.
example/macos/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme	Adds pre-build “prepare Flutter framework” action.
example/macos/Runner.xcodeproj/project.pbxproj	Migrates macOS example project away from CocoaPods towards SwiftPM packages.
example/macos/Podfile	Removed (CocoaPods no longer used by example).
example/macos/Podfile.lock	Removed (CocoaPods no longer used by example).
example/macos/Flutter/Flutter-Debug.xcconfig	Removes Pods xcconfig include.
example/macos/Flutter/Flutter-Release.xcconfig	Removes Pods xcconfig include.
example/ios/Runner/Info.plist	Reorders/adds keys (Bluetooth usage strings retained, scene manifest added).
example/ios/Runner/AppDelegate.swift	Adjusts plugin registration for implicit engine initialization.
example/ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme	Adds pre-build “prepare” action.
example/ios/Runner.xcodeproj/project.pbxproj	Migrates iOS example project away from CocoaPods towards SwiftPM packages; bumps iOS target to 13.1.
example/ios/Podfile	Removed (CocoaPods no longer used by example).
example/ios/Podfile.lock	Removed (CocoaPods no longer used by example).
example/ios/Flutter/Debug.xcconfig	Removes Pods xcconfig include.
example/ios/Flutter/Release.xcconfig	Removes Pods xcconfig include.
example/ios/Flutter/AppFrameworkInfo.plist	Removes MinimumOSVersion entry (now controlled via project settings).
darwin/universal_ble/Package.swift	Adds SwiftPM manifest for the plugin’s shared Darwin sources.
darwin/universal_ble.podspec	Points CocoaPods to SwiftPM source layout; updates Swift version.
darwin/universal_ble/Sources/universal_ble/UniversalBlePlugin.swift	New CoreBluetooth-based implementation for iOS/macOS shared Darwin source.
darwin/universal_ble/Sources/universal_ble/UniversalBleAsyncServiceDiscovery.swift	Adds async service/characteristic/descriptor discovery helper.
darwin/universal_ble/Sources/universal_ble/UniversalBleFilterUtil.swift	Adds custom scan filtering utilities.
darwin/universal_ble/Sources/universal_ble/UniversalBleHelper.swift	Adds enums/helpers and error mapping utilities.
darwin/universal_ble/Sources/universal_ble/UniversalBleLogger.swift	Adds log level-based logger.
darwin/universal_ble/Sources/universal_ble/UniversalBle.g.swift	Adds regenerated Pigeon Swift bindings in SwiftPM layout.
darwin/universal_ble/Sources/universal_ble/include/universal_ble/.gitkeep	Creates include dir placeholder for SwiftPM header search path.
.gitignore	Ignores SwiftPM build artifacts.

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