Feature
* feat(python-sdk): nested collections and documents (32) ([`a6efc63`](https://github.com/numerous-com/numerous-sdk/commit/a6efc63a5fc5615759cd3a058671b471e076590b))
>
> Documents are indexed by a key in a collection, and contain JSON data:
> * Create documents in a collection
> * Manage tags for a document
> * Iterate over documents in a collection (with filtering by tags possible)
> * Read document data
>
> Additionally nested collections are introduced.