refactor(redis_func_cache): improve type hints and code organization

- Add Final type hint to constants module
- Reorder fields in HashConfig dataclass
- Improve docstring formatting and clarity
- Maintain existing functionality and behavior

Author: tanbro

src/redis_func_cache/constants.py

@@ -1,10 +1,12 @@
 """Constants"""
 
-DEFAULT_MAXSIZE = 1024
+from typing import Final
+
+DEFAULT_MAXSIZE: Final = 1024
 """Default maximum size of the cache."""
 
-DEFAULT_TTL = 3600
+DEFAULT_TTL: Final = 3600
 """Default time-to-live in seconds of the cache."""
 
-DEFAULT_PREFIX = "func-cache:"
+DEFAULT_PREFIX: Final = "func-cache:"
 """Default prefix for the cache keys."""

src/redis_func_cache/mixins/hash.py

@@ -48,13 +48,13 @@
 class HashConfig:
     """A :func:`dataclasses.dataclass` Configurator for :class:`.AbstractHashMixin`"""
 
-    serializer: Callable[[Any], bytes]
-    """function to serialize function positional and keyword arguments."""
     algorithm: str
     """name for hashing algorithm
 
     The name must be supported by :mod:`hashlib`.
     """
+    serializer: Callable[[Any], bytes]
+    """function to serialize function positional and keyword arguments."""
     decoder: Optional[Callable[[Hash], KeyT]] = None
     """function to decode hash digest to member of a sorted/unsorted set and also field name of a hash map in redis.