Draft: Reporting My Drive and Shared Drive usage for user or institution

Leaving in draft as will probably need rework or rebase after two pass scan change merged.

Also missing README.md update, version change and tests.

Example of what can be done with results of CSV output (for DAMTP) = https://docs.google.com/spreadsheets/d/1YUDrlxXQiM49NoR4FqrQqmTtbU-G2XZZDOlns46gdyU/edit