Universal image

[mikhailChelbaev]

• Added UniversalImage — a lightweight, platform-agnostic image type that works with both UIKit and SwiftUI
• Updated Avatar and AvatarGroup to use UniversalImage for more flexible local image handling
• Added new image parameter to ButtonVM for simpler and clearer image configuration

Deprecations:

• imageSrc in ButtonVM → use image: UniversalImage
• imageRenderingMode in ButtonVM → use image.withRenderingMode(_:)
• local(_ name: String, _ bundle: Bundle? = nil) in AvatarVM.ImageSource → use local(_ image: UniversalImage)
• sfSymbol in AvatarVM.Placeholder → use image
• icon in AvatarVM.Placeholder → use image