Add key expiration support to KQIR

### Search before asking

- [X] I had searched in the [issues](https://github.com/apache/kvrocks/issues) and found no similar issues.

### Motivation

Currently, KQIR cannot handle expired keys or remove them from the index after they expire.

We need to add this support.

### Solution

_No response_

### Are you willing to submit a PR?

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

The issue names KQIR but does not identify files, tests, or an entry point. Start by locating KQIR's key-index handling and existing expiration behavior, then determine how expired keys should be removed from the index and add coverage showing that expired keys are no longer handled by KQIR.

Written by the indexing model from the issue text.