Enhanced Diagnostics for Data Sources

[MisterGC]

The system should provide improved diagnostic capabilities that allow for tracking and displaying various statistics about the data from each active map data source. The diagnostic data should include, but not be limited to, the number of map features obtained from each data source and the associated data sizes.

This feature requires extending the mapget component to collate and store these statistics as part of its data aggregation and caching processes. Furthermore, the map data sources should be enhanced to provide diagnostic data to the mapget component during the data retrieval and conversion processes.

The diagnostic data should be accessible through the mapget's query interface. This way, users can get insights into the data's origins, the volume of data sourced from each source, and the associated data size, thus improving transparency and troubleshooting capabilities.