[rust client] Client does not generate enums. Bug: oneOf schemas are not correct

Description

Enums are not been generated (there is a TODO though).
The oneOf schemas are not generated correctly. See my pr where I changed the generated code so that it could compile.

openapi-generator version

version 3.3.2 and 4.0.0

OpenAPI declaration file content or url

This is the schema used. See below what caused the bug.

        200:
          description: Ticker/s for the last 24hr
          content:
            application/json:
              schema:
                oneOf:
                  - $ref: '#/components/schemas/ticker24hr'
                  - $ref: '#/components/schemas/ticker24hrlist'

Command line used for generation

'java -jar openapi-generator-cli-3.3.2.jar generate -i binance.yml -o test/ -g rust'

Suggest a fix/enhancement

I am new to rust and are still learning so are a bit unsure if the enums changes are correct if someone can confirm, Ill do a pr to add the enums.

The oneOf bug though, I am not sure how to fix.

fixed in #2244 👍