Add logs view for timer functions

- Create new database table `timer_function_invocations` to track function executions
- Implement `/logs/<function_id>` route in timer routes to fetch and display invocation logs
- Add new logs template for timer functions with detailed invocation information
- Update header templates to include logs URL for timer functions

templates/dashboard/timer_functions/edit.html

@@ -10,7 +10,8 @@ show_logs=True,
 show_client=False,
 show_history=True,
 edit_url=url_for('timer.edit', function_id=function_id),
-cancel_url=url_for('timer.overview')) }}
+cancel_url=url_for('timer.overview'),
+logs_url=url_for('timer.logs', function_id=function_id)) }}
 
 
 <div id="app" class="p-1">