Create script to post reports to PhenoTips variant store

[cklamann]

The script should take a report csv path as input and do the following:

• transform report into long format and separate into separate 'reports' for each participant
• fetch an API token from PT using a client key and secret
• post each participant-level report to the PT variant store endpoint

NB: We currently don't have the specific endpoint for the token or post request that we'll be using, but the script should be written in such a way that we can drop them in when they're available.

This code should go into a new repository, as it's not part of the Stager application, though we'll be tracking progress here for convenience.

[delvinso]

Preliminary steps/notes:

• barebones script should take a report path as an arg and convert it into long format wrt participant codenames, possibly saving each participant-wise report as a csv -> can potentially apply the wrangling used in variant migration for consistency between reports as the reports have changed over time

[delvinso]

Consolidated into #1021