[FEATURE] why kyuubi.engine.type only support one engine? what if i want use multi engines for different sesssion?

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct)

### Search before asking

- [X] I have searched in the [issues](https://github.com/apache/kyuubi/issues?q=is%3Aissue) and found no similar issues.

### Describe the feature

If it support different type of engines(spark/flink/trino) for different sessions?

### Motivation

support multi engines for one kyuubiServer

### Describe the solution

_No response_

### Additional context

_No response_

### Are you willing to submit PR?

- [ ] Yes. I would be willing to submit a PR with guidance from the Kyuubi community to improve.
- [x] No. I cannot submit a PR at this time.

Start by tracing how kyuubi.engine.type is configured and how sessions are assigned to engines in a KyuubiServer. Compare the existing Spark support with the requested Flink and Trino session types. Done means the issue’s multi-engine behavior and configuration are defined and different sessions can use different engines within one server.

Written by the indexing model from the issue text.