Add sha2 in getArtifacts & getDependencies

[Or-Geva]

• All tests passed. If this feature is not already covered by the tests, I added new tests.
• This pull request is created in the jfrog/jenkins-artifactory-plugin repository.

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Sha2 property is missing in buildInfo.getArtifacts() & buildInfo.getDependencies().
This PR adds this property, for example:

[
  {localPath='.../.jenkins/workspace/upload/example.gif', remotePath='example.gif', 
  md5=5ae64b18b98a20fb8c4830cb948e361d, 
  sha256=76aab4ae1bc25344406c67f78f9a3f9a3a4d08325f9872fbd38072af3c036c38, 
  sha1=66af7ebf37464e3100f8036ecd2ca4f2c3ef2d68}
]

Related: jfrog/build-info#605.