Function fetchGTFSSystems

fetchGTFSSystems(url?: string): Promise<GBFSSystem[]>
General Bikeshare Feed Specification (GBFS) Reader
Description
Fetches the list of GBFS systems from the github CSV file

Usage
```
import { fetchGTFSSystems } from 'gis-tools-ts';

const systems = await fetchGTFSSystems();
console.log(systems);
```
Links
- https://github.com/MobilityData/gbfs/blob/master/systems.csv
Parameters
- url: string = 'https://raw.githubusercontent.com/MobilityData/gbfs/refs/heads/master/systems.csv'
  The URL of the CSV file. The default is the one used by GBFS. This variable exists for testing
Returns Promise<GBFSSystem[]>
- an array of systems