feat: add open_in_new icon (#1590)

## 📝 Changes

New icon, who dis?

![Screenshot 2025-01-24 at 4 14
34 PM](https://github.com/user-attachments/assets/1801d3d3-f391-44ff-8876-509a8aad5f19)

## ✅ Checklist

Easy UI has certain UX standards that must be met. In general,
non-trivial changes should meet the following criteria:

- [ ] Visuals match Design Specs in Figma
- [ ] Stories accompany any component changes
- [ ] Code is in accordance with our style guide
- [ ] Design tokens are utilized
- [ ] Unit tests accompany any component changes
- [ ] TSDoc is written for any API surface area
- [ ] Specs are up-to-date
- [ ] Console is free from warnings
- [ ] No accessibility violations are reported
- [ ] Cross-browser check is performed (Chrome, Safari, Firefox)
- [ ] Changeset is added

~Strikethrough~ any items that are not applicable to this pull request.

.changeset/smooth-toys-joke.md

@@ -0,0 +1,5 @@
+---
+"@easypost/easy-ui-icons": minor
+---
+
+Adds OpenInNew icon

easy-ui-icons/src/OpenInNew.json

@@ -0,0 +1,5 @@
+{
+  "name": "open_in_new",
+  "style": "outlined",
+  "source": "@material-symbols/svg-300"
+}