Implement a dataset saver for quantify dataset
Related to #254
Key functionalities:
- "increment"/"build" dataset
- "flushing" to disk
Prototype by Sander avialable in #139 (comment 508073936)
Partially blocked by #254, but design can already start (e.g. how should it work? prototype can be implemented by factoring its responsibilities out of the measurement control #139)
Edited by Victor Negîrneac