core: Remove ParsingContext (#3524)

Dead code

xdsl/irdl/declarative_assembly_format_parser.py

@@ -8,7 +8,6 @@
 import re
 from collections.abc import Callable, Sequence, Set
 from dataclasses import dataclass, field
-from enum import Enum, auto
 from itertools import pairwise
 from typing import cast
 
@@ -115,13 +114,6 @@ def lex(self) -> Token:
     bare_identifier_suffix_regex = re.compile(r"[a-zA-Z0-9_$.\-]*")
 
 
-class ParsingContext(Enum):
-    """Indicates if the parser is nested in a particular directive."""
-
-    TopLevel = auto()
-    TypeDirective = auto()
-
-
 @dataclass(init=False)
 class FormatParser(BaseParser):
     """