[Bug]: Solving polars Deprecation warnings for `is_in`

@adamamer20 is already working on this.

Since Aug 30, 2025.

• #178 by @adamamer20 — merged

### 📝 Description

The codebase is generating multiple deprecation warnings due to the use of Polars' `is_in` method with collections of the same datatype. The warning specifically states:

```
/home/adam/projects/mesa-frames/mesa_frames/concrete/agentset.py:453: DeprecationWarning: is_in with a collection of the same datatype is ambiguous and deprecated.
Please use implode to return to previous behavior.

See https://github.com/pola-rs/polars/issues/22149 for more information.

```

The issue affects multiple files across the codebase where `is_in` is used to check membership of Series/DatFrame elements against other Series/DataFrame columns. The affected pattern is typically:
```python
series.is_in(other_series)
```

Instead of the deprecated `is_in`, we need to use `implode()` to maintain the current behavior, as suggested by the deprecation message.

### 🔄 Steps to Reproduce

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### 🎯 Expected Behavior

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### 🚨 Actual Behavior

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### 🖥️ Python Version

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### Operating System

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### Relevant Packages

polars: >=1.30.0

### 📊 Relevant Log Output

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### ➕ Additional Context

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