Is your feature request related to a problem? Please describe.

APIClient creates a temporary file when decoding a response, but it is not deleted afterwards. This causes the /tmp directory to become bloated over time, which can lead to performance and storage issues.

ref: https://github.com/OpenAPITools/openapi-generator/blob/master/samples/openapi3/client/petstore/go/go-petstore/client.go#L480
https://pkg.go.dev/os#CreateTemp

Describe the solution you'd like

Delete temporary files once it is no longer needed.