prepare_connection plugin hook

Closes:
- #574

Refs #567

---------

Co-authored-by: Simon Willison <swillison@gmail.com>

sqlite_utils/db.py

@@ -37,6 +37,7 @@ from typing import (
     Tuple,
 )
 import uuid
+from sqlite_utils.plugins import pm
 
 try:
     from sqlite_dump import iterdump
@@ -342,6 +343,8 @@ class Database:
         self._registered_functions: set = set()
         self.use_counts_table = use_counts_table
 
+        pm.hook.prepare_connection(conn=self.conn)
+
     def close(self):
         "Close the SQLite connection, and the underlying database file"
         self.conn.close()