[Feature] Support paper_check_scan file upload purpose

[psmejkal]

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

I'm trying to integrate new payments using cheques and I need to upload cheque images into Stripe Files API. To do that, I need the uploadImage with paper_check_scan as purpose which I cannot do right now because STPFilePurpose (and StripeFile.Purpose) doesn't have such case.

Describe the solution you'd like

Add new case to STPFilePurpose and StripeFile.Purpose to support cheque image upload.

Describe alternatives you've considered

I can use the API directly but I would prefer to use the SDK.

Additional context

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[davidme-stripe]

Thanks for filing this! We'll consider it as an improvement for a future update.