query templates: add template to manage replicas

For every row table add new action under alter table item with name "Add read-only replicas"

Activating this menu item must lead to filling the editor with following query text

```
ALTER TABLE `<path-to-table>` SET 
(
   READ_REPLICAS_SETTINGS = 'PER_AZ:1'-- Enable read replicas for stale read, launch one replica in every availability zone. docs: https://clck.ru/3Qh8iQ
)
```