New checksum util to return bytes

[orwaichman]

• [ ] All tests passed. If this feature is not already covered by the tests, I added new tests.
• [ ] All static analysis checks passed.
• [ ] This pull request is on the dev branch.

• [ ] I used gofmt for formatting the code before submitting the pull request.

[github-actions[bot]]

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Thank you for your submission, we really appreciate it. Like many open-source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution. You can sign the CLA by just posting a Pull Request Comment same as the below format.

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I have read the CLA Document and I hereby sign the CLA

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2 out of 4 committers have signed the CLA.
:white_check_mark: @omerzi
:white_check_mark: @eyalbe4
:x: @JFrog Pipelines Step
:x: @orwaichman
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