[IndexTable] Add hasZebraStriping optional prop (#8595)

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### WHY are these changes introduced?

Closes #8592

The Pixels Index Redesign for Customer Events uses IndexTable and zebra
striping is desired.

<!--
  Context about the problem that’s being addressed.
-->

I used the same color variable as the zebra striping in
[DataTable](https://github.com/Shopify/polaris/pull/5365/files#diff-afd7e6258c31974d33a41a0be5cae45bd14466b2e68b17725e11d884ba2647ec).

### WHAT is this pull request doing?

Adds `hasZebraStriping` optional prop on IndexTable.

<img width="950" alt="screenshot of ZebraStriping in storybook"
src="https://user-images.githubusercontent.com/12080891/223773325-30d763c7-4f87-4727-b007-07e3586a3eb8.png">

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### 🎩 checklist

- [x] Tested on
[mobile](https://github.com/Shopify/polaris/blob/main/documentation/Tophatting.md#cross-browser-testing)
- [ ] Tested on [multiple
browsers](https://help.shopify.com/en/manual/shopify-admin/supported-browsers)
- [x] Tested for
[accessibility](https://github.com/Shopify/polaris/blob/main/documentation/Accessibility%20testing.md)
- [ ] Updated the component's `README.md` with documentation changes
- [ ] [Tophatted
documentation](https://github.com/Shopify/polaris/blob/main/documentation/Tophatting%20documentation.md)
changes in the style guide

Author: KateWood

.changeset/chatty-pets-enjoy.md

@@ -0,0 +1,5 @@
+---
+'@shopify/polaris': patch
+---
+
+Added option zebra striping to `IndexTable` ([#8595](https://github.com/Shopify/polaris/pull/8595))

polaris-react/src/components/IndexTable/IndexTable.scss

@@ -197,6 +197,30 @@ $loading-panel-height: 53px;
   color: var(--p-text-subdued);
 }
 
+// Extra specificity is needed to address edge cases where the zebra striping is combined with other options
+// stylelint-disable selector-max-specificity, selector-max-class, selector-max-combinators -- extra specificity needed for when combining props
+.ZebraStriping {
+  .TableRow:nth-child(2n + 1) {
+    background: none;
+  }
+
+  .TableRow:nth-child(2n),
+  .TableRow:nth-child(2n) .TableCell:last-child {
+    background: var(--p-surface-subdued);
+
+    &:hover {
+      background-color: var(--p-surface-hovered);
+    }
+  }
+
+  .TableRow-hovered:nth-child(2n + 1),
+  .TableRow-hovered:nth-child(2n),
+  .TableRow-hovered:nth-child(2n) .TableCell:last-child {
+    background-color: var(--p-surface-hovered);
+  }
+}
+// stylelint-enable selector-max-specificity, selector-max-class, selector-max-combinators
+
 .TableHeading {
   background: var(--p-surface-subdued);
   z-index: var(--p-z-index-1);