[positioner] Can I use the `useAnchorPositioning.SharedParameters` type?

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I'm trying to apply common styles to elements that use the Positioner component. To do this, I need access to the `useAnchorPositioning.SharedParameters` type.

Here's how I'd ideally like to use it:

```ts
import type { useAnchorPositioning } from '@base-ui-components/react';

export type DefaultPositionerProps = useAnchorPositioning.SharedParameters;

export type Side = DefaultPositionerProps['side'];
export type Align = DefaultPositionerProps['align'];

export const defaultPositionerProps: DefaultPositionerProps = {
collisionAvoidance: { align: 'none' },
};
```

This approach would allow me to catch type errors if the type definitions change in the library, which is exactly what I want.

However, the `useAnchorPositioning.SharedParameters` type is not currently exported from the module. My current workaround involves importing it directly from the `node_modules` folder (e.g., `'node_modules/@base-ui-components/react/esm/utils/useAnchorPositioning'`), but this can interfere with tree-shaking and cause other issues.

I was wondering if you have any plans to export the `useAnchorPositioning` function or the `useAnchorPositioning.SharedParameters` type.

Alternatively, I would appreciate it if you could suggest another way to achieve this.

Thanks!