Created by: bkabrda
This PR adds oneOf support in the same way it was added for Java clients recently in #5120. It contains a lot of refactoring to be able to use the same mechanisms as were used to implement this feature for Java. Also see https://github.com/OpenAPITools/openapi-generator/pull/4785 for discussion on semantics of oneOf and thoughts on why it was implemented that way for Java.
Note that this PR doesn't contain any tests right now. I do want to add tests, but would like to do that after the general direction of this PR and the related refactoring is approved.
PR checklist
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