feat: show daily forecast

[Ryuno-Ki]

Each day is also including hourly forecast, but this PR lays the groundwork by talking to the right endpoint.

Instead of day and night values (like in the old weather-widget) I'm showing min and max temperature as forecasted here.

[Ryuno-Ki]

@streetturtle 5 warnings in unrelated widgets. Do you want me to look into them?
(If so here or separate PR)

[streetturtle]

This is amazing! Thank you @Ryuno-Ki 🚀
I'll test it this weekend.

Regarding the luacheck, no worries, I'll fix it.

[xfzv]

Very nice! I've just tried, so far so good.

[xfzv]

Will night icons be added back? After reading Weather API documentation, it seems that is_day is only listed for "hour element":

Field	Data Type	Description
is_day	int	1 = Yes 0 = No - Whether to show day condition icon or night icon

Does it mean that "day element" will always display day icon regardless of the time of the day? Having a sun icon displayed when it's 11 PM is a bit weird.

Weather icons section in the documentation mentions both day: and night: conditions but only one icon: field.

[Ryuno-Ki]

Good question.

You're partially right. It is part of the hour field (I just checked). But the astro one also contains is_moon_up and is_sun_up. Now it is possible that both are true :) But when I would use the is_sun_up to determine which icon to show it should be possible. That would go into the hourly forecast.

Looking at the current field I can see a is_day here which I haven't noticed before.

Are you okay with moving this request to another PR?