[Feature] Use Parquet Merge in compaction for AppendOnlyTable

### Search before asking

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

### Motivation

See more in: https://issues.apache.org/jira/browse/PARQUET-382

This could save lots of resource usage for append only table's compaction.

### Solution

_No response_

### Anything else?

_No response_

### Are you willing to submit a PR?

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

Start by reading the AppendOnlyTable compaction implementation and the linked PARQUET-382 discussion to understand the proposed Parquet Merge behavior. Done means compaction for append-only tables uses Parquet Merge and demonstrates reduced resource usage, but the issue does not name files or tests.

Written by the indexing model from the issue text.