[Feature] Support Secondary Index

### Search before asking

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

### Motivation

We have scenarios which will use many secondary indexes to accelerate query paimon table

### Solution

_No response_

### Anything else?

_No response_

### Are you willing to submit a PR?

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

No file, test, or entry point is named, and the issue provides no proposed solution. Start by locating the Java implementation and tests for Paimon table queries, then define the secondary-index scope and acceptance checks; done should mean a documented, tested design and implementation that accelerates the stated queries.

Written by the indexing model from the issue text.