Adds fhir-data-pipes helm chart

[bennsimon]

Description of what I changed

• Adds the helm chart for pipelines deployment.
  • Includes a sidecar support for deployment of spark-thriftserver alongside pipelines.
• Adds the github workflow to publish helm chart on github as releases.
  • For this to work gh-pages (github pages branch) should be created on this repository.
• Adds the documentation on how to use the helm chart.

E2E test

TESTED:

Tested by deploying pipelines, spark-thriftserver using this helm chart and openldap and spark cluster using open-source charts on a Kubernetes cluster. The services authenticate and communicate as expected.

Spark docker image used: docker.io/bitnami/spark:3.3.2-debian-11-r12

Checklist: I completed these to help reviewers :)

• I have read and will follow the review process.

• I am familiar with Google Style Guides for the language I have coded in.

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• I have added tests to cover my changes. (If you refactored existing code that was well tested you do not have to add tests)

• I ran mvn clean package right before creating this pull request and added all formatting changes to my commit.

• All new and existing tests passed.

• My pull request is based on the latest changes of the master branch.

  No? Unsure? -> execute command git pull --rebase upstream master

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