[Webhost API] Add starting_inventory on the static_tracker call

[OriginalTomPouce]

Add the starting inventory to the API static_tracker call.
The main reason why I'm adding this is because we can fetch the networks items, but not the starting ones, which means we can't get a full player's inventory using API in a bunch of cases.

I feel like that data should go on the static_tracker call because it never changes.

What is this fixing or adding?

Adding a PlayerStartingInventory list on the WebHostLib/api/tracker.py‎ fille
Using that list to fill the new field player_starting_inventory on the static_tracker result.

How was this tested?

With a local webhost, hosting a couple of multiworlds (30+ players).

If this makes graphical changes, please attach screenshots.

"player_starting_inventory":
    [
        {
            "items": [16777239, 16777240, 16777397],
            "player": 1,
            "team": 0
        },
        {
            "items": [234782070],
            "player": 2,
            "team": 0
        },
        {
            "items": [],
            "player": 3,
            "team": 0
        },
        {
            "items": [],
            "player": 4,
            "team": 0
        },
        {
            "items": [105, 119, 134, 3, 3, 3, 3, 3, 20],
            "player": 5,
            "team": 0
        }
    ]