Add version history view for timer functions

- Implement `/history/<function_id>` route in timer routes to fetch and display function versions
- Create new Mithril `DiffView` component for comparing script versions
- Add new history template for timer functions with version comparison
- Include version diff functionality using AceDiff library
- Update header and edit templates to include history URL for timer functions

templates/dashboard/http_functions/editor.html

@@ -10,7 +10,8 @@ show_client=True,
 show_history=True,
 edit_url=edit_url,
 cancel_url=cancel_url,
-logs_url=url_for('get_http_function_logs', function_id=function_id)) }}
+logs_url=url_for('get_http_function_logs', function_id=function_id),
+history_url=url_for('get_http_function_history', function_id=function_id)) }}
 
 
 <div id="app" class="p-1">