feature/issue-6: History metadata

[skorper]

Github Issue: #6

Description

Harmony services need to modify history_json attribute. See https://wiki.earthdata.nasa.gov/display/TRT/In-File+Provenance+Metadata+-+TRT-42

Overview of work done

history_json attribute is added to Concise result. If any parent files contain the history_json attribute, those will be added to the history_json attribute for the result. This means an L2SS-Py + Concise chain result should contain history_json entries from both services.

Overview of verification done

Added a unit test checking for history_json. Tested with single and multi-core mode, and also checked that it works when there is existing history_json metadata in the input files.

Overview of integration done

No integration testing has been done.

PR checklist:

• Linted
• Updated unit tests
• Updated changelog
• Integration testing

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