feat(interactive): Introduce Interactive SDK

[zhanglei1949]

Introduce the SDK of GraphScope Interactive. Including Java SDK and Python SDK. The SDKs are automatically generated from the OpenAPI specification yaml(graphscope_interactive.yaml) using tools provided by OpenAPI.

• [x] The generated code SHOULD not be included in the codebase, user can refer to flex/interactive/sdk/README.md to generate the SDKs if interested.
• [ ] We will publish the Python SDK and Java SDK to PyPi and Maven Central Repo once they are steady.
• [ ] Providing some examples about how to use the SDKs.
• [ ] Add tests in Interactive CI
• [ ] Also add docs for Interactive SDK.