Support for external ID's for Shows

[zeroquinc]

Currently the webhook returns only the Episode or Movie external ID's.
This PR will also return the Show External ID's.

    "SeriesProvider_imdb": "tt0903747",
    "SeriesProvider_tmdb": "1396",
    "SeriesProvider_tvrage": "18164",
    "SeriesProvider_tvdb": "81189",
    "SeriesProvider_tvmaze": "169",
    "Provider_tvdb": "4460282",
    "Provider_imdb": "tt2301471",

[JPVenson]

Suggested change

	if (episode.Series?.ProviderIds is not null)
	{
	foreach (var (providerKey, providerValue) in episode.Series.ProviderIds)
	{
	dataObject[$"SeriesProvider_{providerKey.ToLowerInvariant()}"] = providerValue;
	}
	}
	if (episode.Series?.ProviderIds is not null)
	{
	var providers = new Dictionary<string, object>();
	dataObject["SeriesProviders"] = providers;
	foreach (var (providerKey, providerValue) in episode.Series.ProviderIds)
	{
	providers[providerKey.ToLowerInvariant()] = providerValue;
	}
	}

why not make this a new object instead?

[insomniachi]

why not using use ProviderIds directly ?
dataObject[SeriesProviders] = episode.Series.ProviderIds
or
dataObject[SeriesProviders] = episode.Series.ProviderIds.ToDictionary(x => x.Key, x => x.Value)
if you want a different reference.

looking at the rest of the existing code. there seems to be a conscious effort to avoid objects (look at how media streams are assigned). I don't know what the reason is. changing those could be a breaking change for people.

[insomniachi]

the dataObject dictionary is using StringComparer.OrdinalIgnoreCase comparer, so need to use ToLowerInvariant() on the keys, you're just making more allocations.