Capture additional properties along with autocapture events

[ioannisj]

Description

Provide a way to pass additional properties to autocapture events

• iOS (UIKit & SwiftUI)
• Android
• Flutter
• React Native

docs: https://posthog.com/docs/product-analytics/autocapture#capturing-additional-properties-in-autocapture-events
source: PostHog/posthog.com#9675 (comment)

[ioannisj]

Depends on #179