Specify Content-MD5 when generating presigned URL for uploading object (#1161)

[hardikSinghBehl]

:loudspeaker: Type of change

• [ ] Bugfix
• [x] New feature
• [ ] Enhancement
• [ ] Refactoring

:scroll: Description

Allows contentMD5 value to be specified in the S3 ObjectMetadata.

:bulb: Motivation and Context

Implementation for issue #1161

:green_heart: How did you test it?

The functionality has been tested via an integration test.

:pencil: Checklist

• [x] I reviewed submitted code
• [x] I added tests to verify changes
• [ ] I updated reference documentation to reflect the change
• [x] All tests passing
• [x] No breaking changes

:crystal_ball: Next steps