fix(ToolTip): ensure at most one ToolTip is open at the same time

- a click event closes the tooltip if the target is not the tooltip or
  the tooltip icon.
- the event is registered in the capture phase and a `setTimeout` is used to
  deal with edge cases in which a button is used to toggle the tooltip
  on or off.

src/Tooltip/Tooltip.svelte

@@ -184,6 +184,13 @@
       }
     }
   }}"
+  on:click|capture="{({ target }) => {
+    if (open && !ref.contains(target) && !refTooltip.contains(target)) {
+      setTimeout(() => {
+        open = false;
+      });
+    }
+  }}"
 />
 
 <div