fix(progress-step): forward click event

src/ProgressIndicator/ProgressIndicator.Story.svelte

@@ -26,7 +26,10 @@
       <ProgressStep
         label="First step"
         description="Step 1: Getting started with Carbon Design System"
-        secondaryLabel="Optional label" />
+        secondaryLabel="Optional label"
+        on:click="{() => {
+          console.log('click');
+        }}" />
       <ProgressStep
         label="Second step with tooltip"
         description="Step 2: Getting started with Carbon Design System"

src/ProgressIndicator/ProgressStep.svelte

@@ -77,6 +77,7 @@
     tabindex="{!current && !disabled ? '0' : '-1'}"
     class:bx--progress-step-button="{true}"
     class:bx--progress-step-button--unclickable="{current}"
+    on:click
     on:click="{() => {
       change(step.index);
     }}"