[Feedback]: Use Pascal case for namespaces / class names

[RayHughes]

What's on your mind?

While the PSR declarations provide no recommendation for namespace capitalization, it is pretty standard to use PascalCase when defining namespaces as it aligns with the class name capitalization guidance by PSR 0/4.

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[emawby]

@RayHughes This api is generated from OpenAPI Generator but the feedback has been noted. We may need to submit a PR upstream