Geospatial visualization and statistical analysis features for TimeOverflow

https://github.com/user-attachments/assets/532772d3-1858-4de2-a250-f8669edb3cc8

## Description
As part of my collaborative Master's Thesis (TFM), I have developed two new features for TimeOverflow that complement those already presented in PRs #790, #791, #792, and #796:

1. **Geospatial visualization**: Implementation of tools for visualizing geographic data related to time banks and their users, allowing a better understanding of the spatial distribution of the community and optimizing the search for services by proximity.

2. **Statistical analysis**: Development of functionalities to generate statistical reports and data visualizations about time bank activity, including participation metrics, most frequent exchanges, and temporal trends.

## Proposal
I am willing to prepare a separate PR for each of these new features if the maintenance team is interested in integrating them into the main project.

I look forward to your feedback on whether these features are of interest to the project.