Bugfix/8762 Multiple changes to align S3 multipart checksum support with AWS functionality

[sophieil]

Fixes #8762

Also addresses the point about full object checksums mentioned in #8760, enabling full object checksums where applicable and adding support for CRC64NVME checksums.

Multipart checksum behaviour has been based on AWS docs here, verified using the attached script
moto-8762-aws-behaviour-demo.py.txt which produces the following output:

CRC64NVME - FULL_OBJECT: Object stored with FULL_OBJECT checksum.  Object Attributes response: 'SXtKxXGlB1A='.  Get Object response: 'SXtKxXGlB1A='.
CRC64NVME - COMPOSITE: not a supported combination
CRC64NVME - DEFAULT: Object stored with FULL_OBJECT checksum.  Object Attributes response: 'SXtKxXGlB1A='.  Get Object response: 'SXtKxXGlB1A='.

CRC32 - FULL_OBJECT: Object stored with FULL_OBJECT checksum.  Object Attributes response: '7PweJw=='.  Get Object response: '7PweJw=='.
CRC32 - COMPOSITE: Object stored with COMPOSITE checksum.  Object Attributes response: 'pd+GUQ=='.  Get Object response: 'pd+GUQ==-2'.
CRC32 - DEFAULT: Object stored with COMPOSITE checksum.  Object Attributes response: 'pd+GUQ=='.  Get Object response: 'pd+GUQ==-2'.

CRC32C - FULL_OBJECT: Object stored with FULL_OBJECT checksum.  Object Attributes response: 'yuafwA=='.  Get Object response: 'yuafwA=='.
CRC32C - COMPOSITE: Object stored with COMPOSITE checksum.  Object Attributes response: 'MIeOGQ=='.  Get Object response: 'MIeOGQ==-2'.
CRC32C - DEFAULT: Object stored with COMPOSITE checksum.  Object Attributes response: 'MIeOGQ=='.  Get Object response: 'MIeOGQ==-2'.

SHA1 - FULL_OBJECT: not a supported combination
SHA1 - COMPOSITE: Object stored with COMPOSITE checksum.  Object Attributes response: 'II0B/WXYv6uiHlCAB8ELEj2JIjo='.  Get Object response: 'II0B/WXYv6uiHlCAB8ELEj2JIjo=-2'.
SHA1 - DEFAULT: Object stored with COMPOSITE checksum.  Object Attributes response: 'II0B/WXYv6uiHlCAB8ELEj2JIjo='.  Get Object response: 'II0B/WXYv6uiHlCAB8ELEj2JIjo=-2'.

SHA256 - FULL_OBJECT: not a supported combination
SHA256 - COMPOSITE: Object stored with COMPOSITE checksum.  Object Attributes response: '1kJPjs+5gw2wOP9NXohhWkJdwr6FIR0Zsz3JFkaXgmk='.  Get Object response: '1kJPjs+5gw2wOP9NXohhWkJdwr6FIR0Zsz3JFkaXgmk=-2'.
SHA256 - DEFAULT: Object stored with COMPOSITE checksum.  Object Attributes response: '1kJPjs+5gw2wOP9NXohhWkJdwr6FIR0Zsz3JFkaXgmk='.  Get Object response: '1kJPjs+5gw2wOP9NXohhWkJdwr6FIR0Zsz3JFkaXgmk=-2'.

[sophieil]

Thanks for triggering the checks @bblommers, I will look through and fix