Rather than having all of these modules in their own repos/namespaces, put them in data-service so they're easier to maintain and plugins also have a far simpler dependency tree

• collection-model https://github.com/mongodb-js/collection-model
• connection-model https://github.com/mongodb-js/connection-model
• database-model https://github.com/mongodb-js/database-model
• explain-plan-model https://github.com/mongodb-js/explain-plan-model
• index-model https://github.com/mongodb-js/index-model
• instance-model https://github.com/mongodb-js/instance-model