Add Query Batch Endpoint

[cawfeecoder]

As a user/application, I may want the following:

• Query multiple ids
• Support GraphQL pagination
• Provide a condition on which to restrict my query

[cawfeecoder]

TODO: Support Nested Conditionals and other Query Operators listed https://docs.mongodb.com/manual/reference/operator/query/

Will probably be extracted as it's own seperate package (a la JSON -> Mongo Query engine)