Update generate_matrix entry point to use metadata service

The current entry point for generating adjusted matrices currently reads from spreadsheets/web absolutes and outputs to a json file. This can now be updated to use the metadata service to gather readings and write a matrix while maintaining current functionality.

added In Progress label

mentioned in merge request !76 (merged)

added In Review label and removed In Progress label

mentioned in commit 5f257571

closed with merge request !76 (merged)

removed In Review label