[RFC] JSON handling

[rhazn]

Short Description

We need to be able to handle JSON and tree structures of data. Also includes bson files (mongodb files).

Definition of Done

• [ ] The RFC document is created following the existing pattern
• [ ] A pull request with the RFC document is opened
• [ ] The pull request passed peer review and is accepted
• [ ] An issue is opened that tracks the implementation of the RFC

Note: The details of the RFC will be discussed in the PR, not in this issue!