feat(logging): add LOG_ADMIN_HIDE setting and update logging functionality

Introduce a new configuration option `LOG_ADMIN_HIDE` to control the visibility of admin-generated events in the logs. Update the logging retrieval functions to respect this setting, ensuring that admin actions can be hidden from the "All message logs" UI and CSV exports. Additionally, enhance the README with detailed logging configuration options for better clarity.

db/dal/message_log_dal.py

@@ -22,16 +22,23 @@ async def create_message_log(session: AsyncSession,
         return None
 
 
-async def get_all_message_logs(session: AsyncSession, limit: int,
-                               offset: int) -> List[MessageLog]:
-    stmt = select(MessageLog).order_by(
-        MessageLog.timestamp.desc()).limit(limit).offset(offset)
+async def get_all_message_logs(session: AsyncSession,
+                               limit: int,
+                               offset: int,
+                               hide_admin_events: bool = False) -> List[MessageLog]:
+    stmt = select(MessageLog)
+    if hide_admin_events:
+        stmt = stmt.where(MessageLog.is_admin_event.is_(False))
+    stmt = stmt.order_by(MessageLog.timestamp.desc()).limit(limit).offset(offset)
     result = await session.execute(stmt)
     return result.scalars().all()
 
 
-async def count_all_message_logs(session: AsyncSession) -> int:
+async def count_all_message_logs(session: AsyncSession,
+                                  hide_admin_events: bool = False) -> int:
     stmt = select(func.count()).select_from(MessageLog)
+    if hide_admin_events:
+        stmt = stmt.where(MessageLog.is_admin_event.is_(False))
     result = await session.execute(stmt)
     return result.scalar_one()