[Bug Report] total_steps property for pen-human dataset

[Howuhh]

Describe the bug
Total steps for "pen-human-v0" dataset is none or doesn't exist. Seems like this is true for all adroit datasets.

Code example

import minari

minari.download_dataset("pen-human-v0")
dataset = minari.load_dataset("pen-human-v0")
print(dataset.total_steps)

Additional context
However, this will work

print(dataset.spec.total_steps)

Why doesn't the code just take it out of spec? Why does it either None or re-read from self._data?

Checklist

• I have checked that there is no similar issue in the repo (required)

[younik]

Solved with #101