Add more mypy optional error codes (#3086)

* Add more `mypy` optional error codes

* Update base.py

setup.cfg

@@ -146,6 +146,8 @@ enable_error_code =
   # ignore-without-code,
   possibly-undefined,
   redundant-self,
+  mutable-override,
+  unimported-reveal,
 
 disable_error_code =
   no-untyped-def,

wemake_python_styleguide/violations/base.py

@@ -198,7 +198,7 @@ def _location(self) -> Tuple[int, int]:
 class _BaseASTViolation(BaseViolation):
     """Used as a based type for all ``ast`` violations."""
 
-    _node: Optional[ast.AST]
+    _node: Optional[ast.AST]  # type: ignore[mutable-override]
 
     @final
     def _location(self) -> Tuple[int, int]:
@@ -210,7 +210,7 @@ def _location(self) -> Tuple[int, int]:
 class ASTViolation(_BaseASTViolation):
     """Violation for ``ast`` based style visitors."""
 
-    _node: ast.AST
+    _node: ast.AST  # type: ignore[mutable-override]
 
 
 class MaybeASTViolation(_BaseASTViolation):
@@ -234,7 +234,7 @@ def __init__(
 class TokenizeViolation(BaseViolation):
     """Violation for ``tokenize`` based visitors."""
 
-    _node: tokenize.TokenInfo
+    _node: tokenize.TokenInfo  # type: ignore[mutable-override]
 
     @final
     def _location(self) -> Tuple[int, int]:
@@ -244,7 +244,7 @@ def _location(self) -> Tuple[int, int]:
 class SimpleViolation(BaseViolation):
     """Violation for cases where there's no associated nodes."""
 
-    _node: None
+    _node: None  # type: ignore[mutable-override]
 
     def __init__(
         self,