Add labels block

CHDataManagement/Generator/Blocks/LabelsBlock.swift

@@ -0,0 +1,31 @@
+
+struct LabelsBlock: OrderedKeyBlockProcessor {
+
+    typealias Key = PageIcon
+
+    static let blockId: ContentBlock = .labels
+
+    let content: Content
+
+    let results: PageGenerationResults
+
+    let language: ContentLanguage
+
+    init(content: Content, results: PageGenerationResults, language: ContentLanguage) {
+        self.content = content
+        self.results = results
+        self.language = language
+    }
+
+    func process(_ arguments: [(key: PageIcon, value: String)], markdown: Substring) -> String {
+        let labels: [ContentLabel] = arguments.compactMap { (icon, value) in
+            guard value != "" else {
+                invalid(markdown)
+                return nil
+            }
+            results.require(icon: icon)
+            return .init(icon: icon, value: value)
+        }
+        return ContentLabels(labels: labels).content
+    }
+}