Use new AgentSet functionality in examples

[EwoutH]

Open for contributions!

I would like some example to use the now stabilized AgentSet. This means sometimes self.schedule.agents can be replaced, and sometimes the scheduler could be removed all together. See:

• Original PR: Introduce AgentSet class mesa#1916
• Current docs: https://mesa.readthedocs.io/en/stable/mesa.html#mesa.agent.AgentSet
• Source code: https://github.com/projectmesa/mesa/blob/main/mesa/agent.py#L83
• Original discussion: Deprecate all schedulers and be free to do whatever you want mesa#1912

The approach for this would generally be:

• Read up on AgentSet functionality
• Go through the Mesa examples and seek oppertunities where the AgentSet could simplify or improve things.
• Open a Discussion on mesa-examples proposing your changes
• Implement them and open a PR here

The nuance here being that applying the AgentSet is not a goal to be implemented as much as possible, but a means that could make some model (parts) more elegant, efficient, readable and/or performant.

[EwoutH]

In #153 I removed some schedulers and replaced them with AgentSet functionality. It could be done this way for more models!

[EwoutH]

With Mesa v3.0 alpha 2 (3.0.0a2) released, we can now also start using AgentSet.do(method=Callable) in our examples! See projectmesa/mesa#2219.