Feature proposals: helper utilities

[abidabrar]

Hi,

Great project. i was building something similar for an rpi project, then found this amazing API, saved a lot of work! Surprisingly, MvgApi.stations() returns 43,927 stations (not just Munich, but all of Bavaria!)!

The API is already solid. I have a few ideas that might make it more beginner-friendly and some quality-of-life functionality:

1. String transport types

# Current
departures(transport_types=[TransportType.UBAHN, TransportType.SBAHN])

# Proposed (also accept strings)
departures(transport_types=["U-bahn", TransportType.SBAHN]) # also work with "ubahn"

2. Return multiple station matches

# station() returns first match - add option to get first N?
stations = MvgApi.stations_search("flughafen", limit=5)
# Returns: [Flughafen Besucherpark , Flughafen Nürnberg, Flughafen München... ]

3. Departure sorting

departures(sort_by="time")  # or "line", "type" etc

4. Print helper

MvgApi.print_departures(departures)

Line     Destination                  Planned  Live     Status
---------------------------------------------------------------
U3       Fuerstenried West            14:32    14:32    [OK]
U6       Klinikum Grosshadern         14:33    14:36    [DELAY +3m]
S1       Freising                     14:35    14:35    [OK]

5. Multi-station query

departures_multi(["Marienplatz", "Hauptbahnhof"], sort_by="station", limit_per_station=2)
# or extending the existing departures to accept a list of stations

6. DataFrame export (optional pandas dep)

df = MvgApi.to_dataframe(departures)

Happy to submit PRs if you're interested. Would you prefer small separate PRs or grouped by theme?