`import/consistent-type-specifier-style` for exports

Like `import/consistent-type-specifier-style`, but for exports.

Example:

❌ Invalid with `["error", "prefer-top-level"]`

```ts
export {Foo, type Bar};
```

✅ Valid with `["error", "prefer-top-level"]`

```ts
export type {Bar};
export {Foo};
```