[Improvement] When dropping table, data should be moved to trash instead of being deleted directly

### Search before asking

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

### Motivation

In Paimon, when dropping table, the data is directly removed. We can implement a feature where data is first moved to trash, making it easier to recover accidentally deleted data.

### Solution

Provides a method called `moveToTrash` that is called when data is cleaned up to move data to the trash.

### Anything else?

_No response_

### Are you willing to submit a PR?

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

Start by tracing the table-drop cleanup path and identify where data is currently removed. The issue names the proposed moveToTrash method but no files or tests; confirm the trash location, recovery expectations, and cleanup callers before making changes. Done means dropped-table data is moved to trash rather than deleted directly, with tests covering the new behavior.

Written by the indexing model from the issue text.