Feature/issue 104 add history attributes

[danielfromearth]

GitHub Issue: #104

Description

Adds history_json attribute to output netCDF — to follow TRT-42.

Local test steps

• Tested as local Python package (without Harmony) on granules from TEMPO_NO2_L2_V01 scan 1 (S001, starting at 20130701T131154Z). Confirmed history_json global attribute was present in output netCDF file with schema, date_time, program, version, parameters, derived_from, and program_ref keys.

Overview of integration done

• Tested in local Harmony environment using harmony-py request with Temporal, Spatial and Variable subsettings resulting in use of 24 granules (12 stitchee instances). history_json was present in the output file. See screenshot in the comments below.

PR Acceptance Checklist

• Unit tests added/updated and passing.
• Integration testing
• CHANGELOG.md updated
• Documentation updated (if needed).

[ank1m]

I ran this version of stitchee locally and have history_json in the output file:

[danielfromearth]

I ran this version of stitchee locally and have history_json in the output file:

I think it generally looks good to me, though the l2ss-py history appears to be missing the variable information, so I created an issue here: podaac/l2ss-py#246

@ank1m, did you notice anything amiss? Otherwise I think this is ready to merge.

[ank1m]

the only problem I see is that in Panoply it tries to display the whole history in one line, making it unreadable. It's more of a Panoply issue than ours though.