Implement brush usage in SkiaParagraph

[MatkovIvan]

Proposed Changes

Compose 1.2.0 adds Brush API to TextStyle to provide a way to draw text with complex coloring. Here is implementation of this API for Compose Multiplatform (skiko)

Testing

Test: Use experimental API for passing brush to text style

Text(
    text = text,
    style = TextStyle(
        fontWeight = FontWeight.Bold,
        brush = Brush.linearGradient(
            colors = listOf(Red, Blue)
        )
    )
)

Issues Fixed

Fixes JetBrains/compose-multiplatform#2814