New-rule: force re-export style

Here is a proposal for a new rule: forbidding imports followed by equivalent exports, and prefer re-export syntax instead.

Example:

```typescript
// Forbidden
import { obj } from 'module'
export { obj }

// Allowed
export { obj } from 'module'
```

I didn't find any similar rule in the docs, and I think it would be nice to have one to enforce consistent styling of re-exports.

No implementation file or test path is named. Start by reviewing existing import/export rule implementations and the documentation structure, then trace how rules are tested; done means the new rule consistently rejects equivalent import-and-export pairs, permits direct re-exports, and has corresponding tests and docs.

Written by the indexing model from the issue text.