CSV parsing for natural gas billing inputs

[alanisaac]

The javascript team would like the rules engine to do CSV parsing for the time being for Natural Gas billing inputs. Implement this as a layer on top of the existing rules engine code.

[erika-n]

Is this still applicable? The Javascript will have to load the CSV into the interface before it is sent to the rules engine.

[alanisaac]

We checked in with the JS team this week and confirmed that:

• On the first run, the JS team will loads the CSV into a string, and pass it to the rules engine
• The rules engine will return billing period output to populate the billing period table
• Subsequent runs will pass those object models, with user tweaks (like inclusion overrides) back to the rules engine

[alanisaac]

The parser should be able to handle CSVs from both Eversource and National Grid, and the formats for each are slightly different.

[jkwan2011]

Examples of each file type can be found here: https://drive.google.com/file/d/1vqfbl1VerpECJspUKxGwJs3RQzCveUEW/view?usp=drive_link