Update output for `/all/route_overview`

[matikin9]

https://api.metro.net/all/route_overview

Endpoint should return an array of 3 objects, representing these 3 service types in this order:

• rail
• busway
• bus

Routes will fall into one of these 3 categories based on the route_type field (ignore route_type = express).

[
    {
        ...rail data...
    },
    {
        ...busway data...
    },
    {
        ...bus data...
    }
]

Within the object for each service type, provide the route_type and an array of the routes. Later on we can include things like the service type's icon. The array of routes will be the objects currently being returned in the route_overview endpoint, but sorted by display_order.

Example for rail:

{
    "route_type": "rail",
    "routes": [
        { ...route... },
        { ...route... },
        { ...route... }
    ]
}

Example results:

[
    {
        "route_type": "rail",
        "routes": [
            { ...route... },
            { ...route... },
        ]
    },
    {
        "route_type": "busway",
        "routes": [
            { ...route... },
            { ...route... },
        ]
    },
    {
        "route_type": "bus",
        "routes": [
            { ...route... },
            { ...route... },
        ]
    },
]

[albertkun]

completed at https://api.metro.net/all/route_overview with pr #542

[
  {
    "route_type": "bus",
    "routes": [
      {
        "route_id": "2-13172",
        "route_code": "2",
        "route_code_padded": 2,
        "route_short_name": "2",
        "route_long_name": "Metro Local Line",
        "route_desc": "WESTWOOD - EXPOSITION PARK VIA SUNSET-ALVARADO",
        "route_type": "bus",
        "route_color": "E16710",
        "route_text_color": null,
        "route_url": null,
        "agency_id": "LACMTA",
        "line_id": 2,
        "alt_id": null,
        "long_name": null,
        "description": "USC - Westwood via Sunset Bl",
        "pdf_file_url": "https://cdn.beta.metro.net/wp-content/uploads/2022/10/17200812/002_TT_10-23-22.pdf",
        "pdf_file_link": "https://www.metro.net/line-override/22-10-line-002/attachment/002_tt_10-23-22/",
        "iconography_url": null,
        "terminal_1": "Westwood",
        "terminal_2": "USC",
        "arterials": "Sunset Bl",
        "description_0": "Westwood to USC",
        "description_1": "USC to Westwood",
        "display_order": 0,
        "travel_direction_0": "Eastbound",
        "travel_direction_1": "Westbound",
        "is_active": true
      },
      {
        "route_id": "4-13172",
        "route_code": "4",
        "route_code_padded": 4,
        "route_short_name": "4",
        "route_long_name": "Metro Local Line",
        "route_desc": "DOWNTOWN LA - SANTA MONICA VIA SANTA MONICA BL",
        "route_type": "bus",
        "route_color": "E16710",
        "route_text_color": null,
        "route_url": null,
        "agency_id": "LACMTA",
        "line_id": 4,
        "alt_id": null,
        "long_name": null,
        "description": "Downtown LA - Santa Monica via Santa Monica Bl",
        "pdf_file_url": "https://cdn.beta.metro.net/wp-content/uploads/2022/10/17201140/004_TT_10-23-22.pdf",
        "pdf_file_link": "https://www.metro.net/line-override/22-10-line-004/attachment/004_tt_10-23-22/",
        "iconography_url": null,
        "terminal_1": "Santa Monica",
        "terminal_2": "Downtown LA",
        "arterials": "Santa Monica Bl",
        "description_0": "Santa Monica to Downtown LA",
        "description_1": "Downtown LA to Santa Monica",
        "display_order": 1,
        "travel_direction_0": "Eastbound",
        "travel_direction_1": "Westbound",
        "is_active": true
      },