Wire new native SDK public API: eventTrackingBehavior, singularDeviceId, loadingColor

[claude]

Requested by Ian Rumac · Slack thread

What this adds

• SuperwallOptions.eventTrackingBehavior — controls how much event data is collected and sent (all / superwallOnly / none). This supersedes the now-deprecated SuperwallOptions.isExternalDataCollectionEnabled, which still works and is mapped onto eventTrackingBehavior for backward compatibility.
• singularDeviceId — a new IntegrationAttribute for passing a Singular device ID for attribution.
• PaywallOptions.loadingColor (Android) — sets the color of the paywall loading view. Note the native type is an Android color resource ID (@ColorRes Int?), so callers pass a resource id rather than an ARGB value.

How

• Dart public API lives in lib/src/public/ (Superwall/options classes).
• The Pigeon interface pigeons/configure.dart was regenerated (Dart 3.9.4 / pigeon 26.1.5) to produce the updated Dart, Kotlin, and Swift bridge.
• Native mapping is done in the Android Kotlin and iOS Swift option mappers.
• This branch stacks on Bump native SDKs and release 2.4.13 #146 (base ir/bump-sdks-2.4.13); GitHub will auto-retarget it to develop once Bump native SDKs and release 2.4.13 #146 merges. Basing here keeps the diff scoped to just the new API.
• Package version bumped to 2.5.0.

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