[defect]: rediswho does not have Simultaneous-Use queries

### What type of defect/bug is this?

Unexpected behaviour (obvious or verified by project member)

### How can the issue be reproduced?

The rediswho module should have support for Simultaneous-Use queries.

### Log output from the FreeRADIUS daemon

```shell
Not applicable
```

### Relevant log output from client utilities

_No response_

### Backtrace from LLDB or GDB

```shell

```