Adds signature request as a replacement option for the Vault and Forward API

What’s new

Adds REQUEST_SIGNATURE as a possible enum value for replacements, which defines the fields to be replaced in the forwarded request.

Impact

Stripe can now support Vault and Forward requests that require calculating a request hash as a part of the API. To do this, specify the REQUEST_SIGNATURE replacement for relevant endpoints.

Changes

Value	Change	Enums
request_signature	Added	Forwarding.Request#create.replacements[]Forwarding.Request.replacements[]

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