NewWriterWithACL returns a new `blob.Writer` instance that has been configured with the relevant `blob.WriterOptions` to ensure that files written to S3 will be done using AWS ACL permissions defined in 'acl'.

SetACLWriterOptionsWithContext return a new context.Context instance with a gocloud.dev/blob.WriterOptions instance whose properties are assigned according to 'opt_key' and 'opt_value', where the latter is a valid blob.WriterOptions property and the former is a valid type for that property.

SetWriterOptionsWithContextAndMap is a convenience method for invoking SetWriterOptionsWithContext multiple times.

StringACLToObjectCannedACL resolves a subset of the string values for S3 ACLs (those specific to objects) to their corresponding `github.com/aws/aws-sdk-go-v2/service/s3/types.ObjectCannedACL` instance.