[Umbrella] Implement Kyuubi Chat Engine

### 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) and found no similar issues.

### Describe the proposal

Introduce a brand new CHAT engine, it's supposed to support different backends, e.g. ChatGPT, 文心一言, etc.

### Task list

- #4544
- #4548
- #4554
- #4555
- #4556
- #4558
- #4559
- #4809
- #4810

### Are you willing to submit PR?

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

No files, tests, or entry points are named. Start by reviewing the linked task issues (#4544, #4548, #4554, #4555, #4556, #4558, #4559, #4809, and #4810) to understand the proposed CHAT engine; done means the engine supports multiple backends such as ChatGPT and 文心一言.

Written by the indexing model from the issue text.