Add comprehensive type annotations

- mypy.ini: expanded configuration with module-specific settings
- hookspecs.py: type annotations for hook functions
- plugins.py: typed get_plugins() return value
- recipes.py: full type annotations for parsedate, parsedatetime, jsonsplit
- utils.py: extensive type annotations including Row type alias,
  TypeTracker, ValueTracker, and all utility functions
- db.py: type annotations for Database methods (__exit__,
  ensure_autocommit_off, tracer, register_function, etc.) and
  Queryable class methods
- tests/test_docs.py: updated to match new signature display format

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

sqlite_utils/plugins.py

@@ -1,8 +1,10 @@
+from typing import Dict, List, Union
+
 import pluggy
 import sys
 from . import hookspecs
 
-pm = pluggy.PluginManager("sqlite_utils")
+pm: pluggy.PluginManager = pluggy.PluginManager("sqlite_utils")
 pm.add_hookspecs(hookspecs)
 
 if not getattr(sys, "_called_from_test", False):
@@ -10,12 +12,12 @@ if not getattr(sys, "_called_from_test", False):
     pm.load_setuptools_entrypoints("sqlite_utils")
 
 
-def get_plugins():
-    plugins = []
+def get_plugins() -> List[Dict[str, Union[str, List[str]]]]:
+    plugins: List[Dict[str, Union[str, List[str]]]] = []
     plugin_to_distinfo = dict(pm.list_plugin_distinfo())
     for plugin in pm.get_plugins():
         hookcallers = pm.get_hookcallers(plugin) or []
-        plugin_info = {
+        plugin_info: Dict[str, Union[str, List[str]]] = {
             "name": plugin.__name__,
             "hooks": [h.name for h in hookcallers],
         }