Add new sdk features (3.21.0)

[note11g]

Add New sdk features.

• NaverMap.onMapLongTapped
• NPolygonOverlay.outlinePattern

*NaverMap.onMapLoaded is already added with #315

[Copilot]

Pull Request Overview

Adds support for long-tap map events and customizable polygon outline patterns across iOS, Android, and Dart.

• Introduce onMapLongTapped callback in platform event delegates and controllers
• Add DisplayUtil for consistent dp↔px conversion and migrate image scaling
• Support outlinePattern for polygon and polyline overlays (iOS & Android)

Reviewed Changes

Copilot reviewed 24 out of 24 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
ios/Classes/view/NaverMapViewEventDelegate.swift	Handle long-tap events and forward to Flutter
ios/Classes/util/DisplayUtil.swift	New utility for screen-scale–aware dp↔px conversion
ios/Classes/util/CalcUtil.swift	Convert class to struct for consistency
ios/Classes/model/map/overlay/overlay/NPolylineOverlay.swift	Switch pattern conversion to use double values
ios/Classes/model/map/overlay/overlay/NPolygonOverlay.swift	Add outlinePatternPx and apply to polygon overlay
ios/Classes/model/map/overlay/NOverlayImage.swift	Use DisplayUtil.scale when scaling overlay images
ios/Classes/controller/overlay/handler/PolygonOverlayHandler.swift	Extend protocol to support outline pattern
ios/Classes/controller/overlay/OverlayController.swift	Implement setOutlinePattern for polygon and adjust polyline pattern
ios/Classes/controller/NaverMapController.swift	Forward onMapLongTapped to Dart channel
ios/Classes/controller/NaverMapControlSender.swift	Declare onMapLongTapped in sender protocol
example/lib/main.dart	Wire onMapLongTapped callback in example app
example/lib/design/theme.dart	Update snackbar theme for example app
android/.../view/NaverMapView.kt	Register/unregister long-tap listener
android/.../overlay/overlay/NPolylineOverlay.kt	Change patternDp from Int to Double
android/.../overlay/overlay/NPolygonOverlay.kt	Add outlinePatternDp and set it on overlay
android/.../converter/DefaultTypeConverter.kt	Enhance asDouble to accept Int
android/.../controller/overlay/handler/PolygonOverlayHandler.kt	Add handler entry for outlinePattern
android/.../controller/overlay/OverlayController.kt	Override setOutlinePattern for polygon
android/.../controller/NaverMapController.kt	Invoke Dart for onMapLongTapped
android/.../controller/NaverMapControlSender.kt	Add onMapLongTapped to control-sender interface

Comments suppressed due to low confidence (2)

ios/Classes/util/DisplayUtil.swift:15

• Consider adding a unit test for dpToPx to verify correct conversion across different screen scales.

static func dpToPx(dp: Double) -> Double {

ios/Classes/util/DisplayUtil.swift:16

• In Swift, multiplying a Double by a CGFloat isn’t allowed directly—cast scale to Double (e.g. return dp * Double(scale)) to avoid a compile error.

return dp * scale