Extend AgentSet for Advanced Management

[ai-naymul]

Implement methods in AgentSet for grouping, tagging, and managing agents based on types or custom attributes.

Here is my approach:

1. Implement group_by Method
   Task: Add a method to group agents by a specified attribute.
   Key Actions:
   Define the group_by method to categorize agents based on an attribute.
2. Implement tag Method
   Task: Develop a method to tag agents for easy retrieval.
   Key Actions:
   Create the tag method allowing tagging of agents with a custom identifier.
3. Implement get_by_tag Method
   Task: Add a method to retrieve agents by their tags.
   Key Actions:
   Define the get_by_tag method to fetch agents based on a previously assigned tag.
4. Write Unit Tests
   Task: Ensure the new methods work as expected.
   Key Actions:
   Test group_by with various attributes.
   Verify tag and get_by_tag correctly assign and retrieve tagged agents.
5. Update Documentation
   Task: Document the new methods in the AgentSet class.
   Key Actions:
   Explain the purpose, usage, and examples for group_by, tag, and get_by_tag.
6. Demonstrate Usage in Examples
   Task: Show how to use the new methods in example models.
   Key Actions:
   Incorporate group_by, tag, and get_by_tag in simulation models to demonstrate their utility.

Looking forward for your feedbacks :)

[quaquel]

As stated before, I fail to see the point of 2 and 3. A tag is an attribute, so the get method in agent set covers this already.

Other than that, good idea and let's get this done.

[EwoutH]

@ai-naymul great ideas!

On 2 and 3, my main question would be, how would a tag differ from a regular agent attribute on which you can select etc.?