examples/rgw: teach boto about the BLAKE3 checksum algorithm

[cbodley]

allow boto clients like awscli to use BLAKE3 as a checksum algorithm

$ aws s3api put-object help
...
       --checksum-algorithm (string)
          Indicates  the  algorithm used to create the checksum for the object
          when you use the SDK. This header will not  provide  any  additional
          functionality  if  you don't use the SDK. When you send this header,
          there must  be  a  corresponding  x-amz-checksum-*algorithm*  ``  or
          ``x-amz-trailer  header sent. Otherwise, Amazon S3 fails the request
          with the HTTP status code 400 Bad Request .
...
          Possible values:
          o CRC32
          o CRC32C
          o SHA1
          o SHA256
          o BLAKE3
...
       --checksum-blake3 (string)
          This header can be used as a data integrity check to verify that the
          data received is the same data that was originally sent. This header
          specifies the base64-encoded, 256-bit BLAKE3 checksum of the object.
          For more information, see Checking object integrity in the Amazon S3
          User Guide . This checksum algorithm is a Ceph RGW extension.
...
OUTPUT
...
       ChecksumBLAKE3 -> (string)
          The base64-encoded, 256-bit BLAKE3 checksum of the object. This will
          only be present if it was uploaded with the object.  With  multipart
          uploads,  this  may  not be a checksum value of the object. For more
          information about how checksums are calculated  with  multipart  up-
          loads,  see  Checking object integrity in the Amazon S3 User Guide .
          This checksum algorithm is a Ceph RGW extension.

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[cbodley]

i made this by copying all of the CRC32C pieces from https://github.com/boto/botocore/blob/develop/botocore/data/s3/2006-03-01/service-2.json and renaming to BLAKE3

[mattbenjamin]

excellent! I'll try this out shortly; thanks for working on this