Add the possibilty to annotate Timeseries dataset (for anomaly detection problems)

[gitting-guud]

Timeseries are structured data

t1 v1
t2 v2
...

The goal would be to select a span ti -> tj that would be labelled as anomaly.

The span could be all the timeserie (from the start to the end) in that case, this would be a timeserie categorisation task.

There would be multiple timeseries at once (not sure how to handle this case)