New pipeline branch

[Aliraza-N]

New files in this PR: src/main/java/com/google/cloud/healthcare/etl/runner/dicomtofhir/DicomToFhirStreamingRunner.java src/main/java/com/google/cloud/healthcare/etl/model/mapping/HclsApiDicomMappableMessage.java src/main/java/com/google/cloud/healthcare/etl/model/mapping/HclsApiDicomMappableMessageCoder.java

The others were already reviewed as part of another PR

[Aliraza-N]

Hi, this PR is for the DICOM to FHIR pipeline. Could you please review it? I've mentioned the new files in the description. @lastomato @dranderson1117

[lastomato]

I just realized I misclicked approve earlier this afternoon, I didn't find a way to unapprove, so I requested another review for myself. Sorry for the confusion.

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[poojavenkatram]

@googlebot I signed it!

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[dranderson1117]

LGTM

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