make `PasqalTarget` inherit from `qiskit`'s `Target` class

[Doomsk]

quoting @awennersteen :

"How big of an issue is it to make this inherit from whatever class the Qiskit targets use?"

[awennersteen]

At least for the purpose of the Slurm project it looks like we can also skip that there.

So it doesn't look like this is super important yet. If you have anything - Please do push, but o/w we can wait until much later