Update regex to support non-trimmed strings

Author: NicolaVerbeeck

lib/config/yml_generator_config.dart

@@ -368,9 +368,9 @@ class YmlGeneratorConfig {
   }
 
   ItemType _parseSimpleType(String type) {
-    final listRegex = RegExp(r'^[Ll]ist<\s*([a-zA-Z_0-9]*)\s*>\s*$');
+    final listRegex = RegExp(r'^\s*[Ll]ist<\s*([a-zA-Z_0-9]*)\s*>\s*$');
     final mapRegex =
-        RegExp(r'^[Mm]ap<([a-zA-Z_0-9]*)\s*,\s*([a-zA-Z_0-9]*)\s*>\s*$');
+        RegExp(r'^\s*[Mm]ap<([a-zA-Z_0-9]*)\s*,\s*([a-zA-Z_0-9]*)\s*>\s*$');
 
     final lowerType = type.toLowerCase();