Move some extensions into SAX package.

Modules/Parser/Sources/SAX/Extensions/Dictionary+SAX.swift

@@ -0,0 +1,28 @@
+//
+//  Dictionary+Parser.swift
+//
+//
+//  Created by Brent Simmons on 8/18/24.
+//
+
+import Foundation
+
+extension Dictionary where Key == String, Value == String {
+
+	func object(forCaseInsensitiveKey key: String) -> String? {
+
+		if let object = self[key] {
+			return object
+		}
+		
+		let lowercaseKey = key.lowercased()
+
+		for (oneKey, oneValue) in self {
+			if lowercaseKey.caseInsensitiveCompare(oneKey) == .orderedSame {
+				return oneValue
+			}
+		}
+
+		return nil
+	}
+}