Module presigning

Presigned request types and configuration.

The Client is used to create presigned requests. They are made by calling .presigned() instead of .send() on an operation, and require a PresigningConfig to provide an expiration time.

Only operations that support presigning have the presigned() method on them.

Structs

• PresignedRequest
  Represents a presigned request. This only includes the HTTP request method, URI, and headers.
• PresigningConfig
  Presigning config values required for creating a presigned request.
• PresigningConfigBuilder
  Builder used to create PresigningConfig.
• PresigningConfigError
  PresigningConfig build errors.