Center coordinate or Bounding box definition in feed_info.txt

### Describe the problem

In cases where multiple GTFS files are used, each GTFS package may need a center point to focus on the area it represents on the map (e.g. city). What do you think about adding fields like
**center_lat**
**center_lon**
**default_zoom**
to the **feed_info.txt** file for this information?

### Use cases

In an application where urban travel planning is done for different cities, the first thing to do is to center the selected city on the map. This information can be kept in a separate dataset or can be pulled from the selected package since it is dependent on the list of GTFS packages.

### Proposed solution

My suggestion is to add the following fields to your feed_info.txt file:
**center_lat**
**center_lon**
**default_zoom**

### Additional information

_No response_