Make random number generator optional in creation of AgentSet, take R…

[verisimilidude2]

Merge branch into main

[github-actions]

Performance benchmarks:

Model	Size	Init time [95% CI]	Run time [95% CI]
BoltzmannWealth	small	🔵 -0.7% [-1.4%, -0.1%]	🔵 -0.6% [-0.9%, -0.4%]
BoltzmannWealth	large	🔵 -0.6% [-1.5%, +0.3%]	🔵 -1.6% [-3.9%, +0.5%]
Schelling	small	🔵 +0.1% [-0.1%, +0.3%]	🔵 -0.4% [-0.7%, -0.1%]
Schelling	large	🔵 -0.3% [-0.9%, +0.2%]	🔵 -0.5% [-2.1%, +0.8%]
WolfSheep	small	🔵 -0.1% [-0.4%, +0.2%]	🔵 +0.3% [+0.1%, +0.5%]
WolfSheep	large	🔵 -0.4% [-1.4%, +0.7%]	🔵 -0.0% [-0.4%, +0.5%]
BoidFlockers	small	🔵 -0.8% [-1.3%, -0.2%]	🔵 -0.5% [-0.7%, -0.2%]
BoidFlockers	large	🔵 +0.4% [-0.5%, +1.1%]	🔵 -0.0% [-0.4%, +0.3%]

[verisimilidude2]

Change int cast that Ruff complained about

[quaquel]

Looks good to me. A few minor requests

1. Can you expand the PR description
2. Can you resolve the conflict

Thanks!

[jackiekazil]

Agree with @quaquel.
Thank you for the contribution @verisimilidude2! Looking forward to getting this merged in with those updates.

[verisimilidude2]

@quaquel I'm not sure how one changes the PR description. The diff on the note on the AgentSet class pretty much describes what I did:
Was:
A UserWarning is issued if random=None. You can resolve this warning by explicitly
passing a random number generator. In most cases, this will be the seeded random number
generator in the model. So, you would do random=self.random in a Model or Agent instance.
Now:
If random is None then the random number generator in the model of the first agent is used.
If the agents list is empty a user warning is issued and the agent set is an empty list
with no random number generator