feat: add measureContent support for Nitro Views

[patrickkabwe]

Closes #1199

This PR adds native self-measurement for Nitro Views.

• Opt in with MeasurableView
• Yoga calls measureContent(...)
• Props, layout context, and constraints are passed to native code
• No .nitro.ts changes needed

Swift

final class HybridNitroTextView: HybridNitroTextViewSpec, MeasurableView {
  let view = UILabel()

  static func measureContent(
    props: NitroTextViewProps,
    layoutContext: LayoutContext,
    layoutConstraints: LayoutConstraints
  ) -> Size {
    let maxWidth = layoutConstraints.maximumSize.width
    let width = min(Double(props.text.count * 8), maxWidth)
    let lineCount = ceil(Double(props.text.count * 8) / maxWidth)
    let height = lineCount * props.fontSize * 1.2

    return Size(width: width, height: height)
  }
}

Kotlin

class HybridNitroTextView(context: Context) : HybridNitroTextViewSpec() {
  override val view = TextView(context)

  companion object : MeasurableView<NitroTextViewProps> {
    override fun measureContent(
      props: NitroTextViewProps,
      layoutContext: LayoutContext,
      layoutConstraints: LayoutConstraints,
    ): Size {
      val maxWidth = layoutConstraints.maximumSize.width
      val width = minOf(props.text.length * 8.0, maxWidth)
      val lineCount = ceil((props.text.length * 8.0) / maxWidth)
      val height = lineCount * props.fontSize * 1.2

      return Size(width, height)
    }
  }
}

ANDROID	IOS
measureContent-android.mp4	measureContent-ios.mov

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