[RAC] Add support for children to <ColorSwatch>

### Provide a general summary of the feature here

Add a `children` prop to `` that can take a `ReactNode` or a render prop that is passed the swatch color that returns a `ReactNode`.

### 🤔 Expected Behavior?

With a ReactNode

```tsx

Aa

```

or with a render prop

```tsx

{({ color }) => (

Aa

)}

```

### 😯 Current Behavior

`` doesn't render any `children`.

### 💁 Possible Solution

I think the starting point is to add `children` to the render props here: https://github.com/adobe/react-spectrum/blob/93c26d8bd2dfe48a815f08c58925a977b94d6fdd/packages/react-aria-components/src/ColorSwatch.tsx#L18-L25

I'm not sure what else if anything would be needed.

### 🔦 Context

I have a swatch that renders some text on top of the selected color in order to demonstrate text contrast, e.g.:


This is currently being done with `` by absolutely positioning the text element on top of the swatch relative to a shared parent.

### 💻 Examples

_No response_

### 🧢 Your Company/Team

_No response_

### 🕷 Tracking Issue

_No response_

Start at packages/react-aria-components/src/ColorSwatch.tsx, especially the render props around lines 18–25 mentioned in the issue. Check how ColorSwatch currently handles its color and rendering, then verify the ReactNode and render-prop examples; done means children render inside the swatch in both supported forms.

Written by the indexing model from the issue text.