[OPENAPI][Connector V2] is there openapi spec for rest api v2 ?

### Search before asking

- [x] I had searched in the [feature](https://github.com/apache/seatunnel/issues?q=is%3Aissue+label%3A%22Feature%22) and found no similar feature requirement.

### Description

- looking for openapi spec for rest api v2

### Usage Scenario

- if we have openapi spec we can generate clients for seatunnel in many languages such as pythpn, rust, go, easily.

### Related issues

_No response_

### Are you willing to submit a PR?

- [x] Yes I am willing to submit a PR!

### Code of Conduct

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