Updated the parser to support double quotes

hydrolib/core/dflowfm/xyn/parser.py

@@ -25,12 +25,20 @@ def parse(filepath: Path) -> Dict:
         Raises:
             ValueError: if a line in the file cannot be parsed
                 or if the name contains whitespace while not surrounded with
-                single quotes.
+                single or double quotes.
         """
 
-        def is_surrounded_by_quotes(name: str) -> bool:
+        def is_surrounded_by_single_quotes(name: str) -> bool:
             return name.startswith("'") and name.endswith("'")
 
+        def is_surrounded_by_double_quotes(name: str) -> bool:
+            return name.startswith('"') and name.endswith('"')
+
+        def is_surrounded_by_quotes(name: str) -> bool:
+            return is_surrounded_by_single_quotes(
+                name
+            ) or is_surrounded_by_double_quotes(name)
+
         def may_contain_whitespace(name: str) -> bool:
             return is_surrounded_by_quotes(name)