Add new alert API

[mikhailChelbaev]

• added a new method to present an alert with item:

func suAlert<Item>(
    item: Binding<Item?>,
    model: @escaping (Item) -> AlertVM,
    primaryAction: ((Item) -> Void)? = nil,
    secondaryAction: ((Item) -> Void)? = nil,
    onDismiss: (() -> Void)? = nil
) -> some View where Item : Identifiable

• changed methods to present modals with items:
  param model: ModalVM, replaced with model: @escaping (Item) -> ModalVM
• fixed bug where modals and alerts were not displayed at app launch when isPresented = true