Openapi-generator fails to produce sdk code for API V0.2

[demeringo]

Describe the bug

When attempting to generate the SDK for API V0.2.0 alpha, generated code does not consider the oneOf or anyOf properties (for example in the time_workload of cloud usage in https://dev.api.boavizta.org/docs#/cloud/instance_cloud_impact_v1_cloud_aws_post)

Known bug in open-api generator:

• [BUG] [rust-client] oneOf is mapped into a struct instead of enum OpenAPITools/openapi-generator#9497

Maybe we could try a alternative sdk generator:

• https://github.com/oxidecomputer/progenitor
• initially mentionned in this threadq [BUG] [typescript-fetch] Union types mixing objects and primitives generate invalid types OpenAPITools/openapi-generator#7868 and Progenitor port zerotier/zeronsd#186

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
Generate an enum with the different variants of time_workload (a f32 or a list of workload_time structs) instead of an empty struct.

Additional context
Add any other context about the problem here.