feat(client): improve generated client documentation to include spec's `info` block

I.e. to say "this Client interacts with the `${info.title}`"

Would require a bit more of a refactor due to `GenerateTemplates`' parameters.

Instead of i.e. https://github.com/oapi-codegen/oapi-codegen/blob/HEAD/examples/client/client.gen.go#L31-L32