feat(redis): add native JSON session storage for 4.1.0

- Add opt-in SESSION_REDIS_JSON storage for asyncio Redis backends.
- Check JSON command support at startup and reject JSON mode on Trio.
- Read legacy strings and migrate sessions on their next save.
- Validate JSON objects before transactional replacement and expiry.
- Preserve tagged serialization for datetime, tuple, and other types.
- Cover command contracts, error handling, and session round-trips.
- Document server requirements, permissions, and migration limits.
- Normalize indentation and whitespace across code, tests, and examples.
- Bump the package and lockfile to 4.1.0 and update the changelog.
- Refresh the locked pycparser dependency to 3.12.

quart_session/redis_trio/errors.py

@@ -1,33 +1,29 @@
 # -*- coding: utf-8 -*-
 """
-    quart_session.redis_trio.errors
-    ~~~~~~~~~~~~~~~~~~~~~~
+  quart_session.redis_trio.errors
+  ~~~~~~~~~~~~~~~~~~~~~~
 
-    A simple Redis Trio client.
+  A simple Redis Trio client.
 
-    :copyright: (c) 2017 by Bogdan Paul Popa.
-    :copyright: (c) 2019 by Oleksii Aleksieiev.
-    :copyright: (c) 2020 by dsc.
-    :license: BSD, see LICENSE for more details.
+  :copyright: (c) 2017 by Bogdan Paul Popa.
+  :copyright: (c) 2019 by Oleksii Aleksieiev.
+  :copyright: (c) 2020 by dsc.
+  :license: BSD, see LICENSE for more details.
 """
 
-
 class RedisError(Exception):
-    """Base class for all Redis-related errors.
-    """
-
+  """Base class for all Redis-related errors.
+  """
 
 class ProtocolError(RedisError):
-    """Raised when Redis responds with something that doesn't conform
-    to the protocol.
-    """
-
+  """Raised when Redis responds with something that doesn't conform
+  to the protocol.
+  """
 
 class ResponseError(RedisError):
-    """Raised when Redis returns an error response.
-    """
-
+  """Raised when Redis returns an error response.
+  """
 
 class ResponseTypeError(ResponseError):
-    """Raised when Redis returns an error response with a `WRONGTYPE` prefix.
-    """
+  """Raised when Redis returns an error response with a `WRONGTYPE` prefix.
+  """