feat: Adds stack separators, removes some unused nodes from cli-doc module

Sources/CliDocCore/Nodes/VStack.swift

@@ -1,26 +1,57 @@
 /// A vertical stack of text nodes.
 ///
 ///
-
 public struct VStack: TextNode {
   @usableFromInline
   let content: [any TextNode]
 
-  @usableFromInline
-  let separator: Separator.Vertical
-
   @inlinable
   public init(
-    separator: Separator.Vertical = .newLine(count: 1),
     @TextBuilder content: () -> any TextNode
   ) {
     self.content = array(from: content())
-    self.separator = separator
   }
 
   @inlinable
   public var body: some TextNode {
-    content.removingEmptys()
-      .joined(separator: separator.render())
+    style(.separator(.newLine(count: 1)))
+  }
+}
+
+public extension VStack {
+
+  func style<S: VStackStyle>(_ style: S) -> some TextNode {
+    style.render(content: .init(content: content.removingEmptys()))
+  }
+
+  func separator(_ separator: Separator.Vertical) -> some TextNode {
+    style(.separator(separator))
+  }
+}
+
+// MARK: - Style
+
+public protocol VStackStyle: TextModifier where Content == StackConfiguration {}
+
+public extension VStackStyle where Self == VStackSeparatorStyle {
+
+  static func separator(_ separator: Separator.Vertical) -> Self {
+    VStackSeparatorStyle(separator: separator)
+  }
+
+}
+
+public struct VStackSeparatorStyle: VStackStyle {
+  @usableFromInline
+  let separator: Separator.Vertical
+
+  @usableFromInline
+  init(separator: Separator.Vertical) {
+    self.separator = separator
+  }
+
+  @inlinable
+  public func render(content: StackConfiguration) -> some TextNode {
+    AnySeparatableStackNode(content: content, separator: separator)
   }
 }