feat: add openmeteo weather provider (#939)

Add OpenMeteo to the selectable weather prediction providers.

Also add tests and documentation.

Signed-off-by: Bobby Noelte <b0661n0e17e@gmail.com>

docs/_generated/configweather.md

@@ -45,6 +45,7 @@
            "providers": [
                "BrightSky",
                "ClearOutside",
+               "OpenMeteo",
                "WeatherImport"
            ]
        }