feat(widget-color): add color widget (#4437)

website/content/docs/widgets/color.md

@@ -0,0 +1,22 @@
+---
+label: 'Color'
+title: color
+---
+
+The color widget translates a color picker to a color string.
+
+- **Name:** `color`
+- **UI:** color picker
+- **Data type:** string
+- **Options:**
+  - `default`: accepts a string; defaults to an empty string. Sets the default value
+  - `allowInput`: accepts a boolean, defaults to `false`. Allows manual editing of the color input value
+  - `enableAlpha`: accepts a boolean, defaults to `false`. Enables Alpha editing
+- **Example:**
+  ```yaml
+  - { label: 'Color', name: 'color', widget: 'color' }
+  ```
+- **Example:**
+  ```yaml
+  - { label: 'Color', name: 'color', widget: 'color', enableAlpha: true, allowInput: true }
+  ```