Move Final annotations to class level and add type annotations to __slots__ classes

This change improves type safety and code organization by:
- Moving all Final annotations from constructors to class level for consistency
- Adding proper type annotations to all __slots__ classes
- Simplifying constructor assignments by removing redundant type annotations

Classes updated:
- HistoricHookCaller: 5 Final attributes moved to class level
- NormalHookCaller: 4 Final attributes moved to class level
- HookImpl: 11 Final attributes moved to class level
- HookspecMarker: _project_spec moved to class level with Final
- HookimplMarker: _project_spec moved to class level with Final
- HookspecConfiguration: 4 Final attributes moved to class level
- HookimplConfiguration: 6 Final attributes moved to class level
- HookRelay: Added __dict__ type annotation
- SubsetHookCaller: Added type annotations for _orig and _remove_plugins
- HookSpec: Added type annotations for all 8 attributes
- Result: Added type annotations for all 3 attributes

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: RonnyPfannschmidt

src/pluggy/_hook_callers.py

@@ -631,6 +631,17 @@ class HookImpl:
         "trylast",
         "hookimpl_config",
     )
+    function: Final[_HookImplFunction[object]]
+    argnames: Final[tuple[str, ...]]
+    kwargnames: Final[tuple[str, ...]]
+    plugin: Final[_Plugin]
+    plugin_name: Final[str]
+    wrapper: Final[bool]
+    hookwrapper: Final[bool]
+    optionalhook: Final[bool]
+    tryfirst: Final[bool]
+    trylast: Final[bool]
+    hookimpl_config: Final[HookimplConfiguration]
 
     function: Final[_HookImplFunction[object]]
     argnames: Final[tuple[str, ...]]