[Feature] Support to order data by keys in append only writer

### Search before asking

- [x] I searched in the [issues](https://github.com/apache/paimon/issues) and found nothing similar.

### Motivation

realted to #7253 , order data in append only writer

### Solution

_No response_

### Anything else?

_No response_

### Are you willing to submit a PR?

- [ ] I'm willing to submit a PR!

Start by reading related issue #7253 and locating the append only writer implementation in the Paimon codebase. Clarify which data keys should define ordering and the expected behavior before choosing an implementation. Done means the agreed key ordering is supported and verified for append-only writes.

Written by the indexing model from the issue text.