Add units to BlackBodySimpleSource

[isaacgsmith]

We would like to make the BlackBodySimpleSource.create_packets() method (in tardis/montecarlo/packet_source.py) unit-sensitive. That is, we would like to take in quantities with units and return quantities with units.

Additional context A potential thing to think about here is how this method is used in the code, and having that be unit-sensitive as well. Remembering that this class can be replaced by a user's own packet source, do we want to require that the user's function includes units? That may be something for @wkerzendorf to answer.

[rishav-karanjit]

Hey, I really wanna work on this issue. Can this issue be assigned to me please?

[jayantbhakar]

Hi, is this issue still open? I want to know exactly how the unit will be taken as input?

[AyushiDaksh]

@wkerzendorf In case of Custom packet source, do we really want to force the user to take in quantities with units and return quantities with units?

[laksh-krishna-sharma]

@wkerzendorf
Hey, I really want to work on this issue. As I am very curious about modern physics and also having a pretty good understanding about physics and Python as well. So please can this issue be assigned to me please?