Data: Wrangle for ImpactEd

[avisionh]

Summary

This branch wrangles the data so that it is in a format suitable for ImpactEd. In particular, they want it in a wider format so they can conduct their own analysis on it.

A lot of this code is inspired by @nacnudus approach in wrangle-final-data branch, indeed there is some duplication (we worked on our branches in parallel). I think the main difference is that his one formats it in a tidy manner whereas my one formats it so it's tailored to ImpactEd's data structure.

Checklists

General checks

• Code runs
• Developments are secure and ethical)
• You have made proportionate checks that the code works correctly
• Test suite passes
• Assumptions, and caveats log updated (see docs/aqa/assumptions_caveats.md), if necessary
• Minimum usable documentation written in the docs folder

Project-specific checks

These are additional checks determined necessary according to the analytical quality assurance plan
(see docs/aqa/aqa_plan.md).

• Code runs.
• The data is in wide format.
• The logic for randomly allocating rank when we have duplicate rows but different response is sound (L25-31 in src/make_data/02_link_data.R)