Add pagination to `avn service log`

[rolintoucour]

What is currently missing?

Currently we can get up to 500 logs entries but there is no way to see previous logs. In our case, we need to get logs of few hours / few days before, to diagnose some issues we have.

How could this be improved?

• add a param to service log to query for a given offset (but the offset will always change, when logs entries arrive, so this is not the best but already good)
• allow to query logs by start / end dates (but probably hard for you as there seems to be no API for it)

Is this a feature you would work on yourself?

No

[ ] I plan to open a pull request for this feature