dev: Added initial version of the grpc api. Added relevant dummy settings to creds (they have no effect rn)

dev: Yt searches now INTERNALLY return multiple results but there is no way right now to paginate plain text results
dev: moved some stuff around

src/NadekoBot/_common/Impl/ImageCache.cs

@@ -0,0 +1,71 @@
+namespace NadekoBot.Services;
+
+public sealed class ImageCache : IImageCache, INService
+{
+    private readonly IBotCache _cache;
+    private readonly ImagesConfig _ic;
+    private readonly Random _rng;
+    private readonly IHttpClientFactory _httpFactory;
+
+    public ImageCache(
+        IBotCache cache,
+        ImagesConfig ic,
+        IHttpClientFactory httpFactory)
+    {
+        _cache = cache;
+        _ic = ic;
+        _httpFactory = httpFactory;
+        _rng = new NadekoRandom();
+    }
+
+    private static TypedKey<byte[]> GetImageKey(Uri url)
+        => new($"image:{url}");
+
+    public async Task<byte[]?> GetImageDataAsync(Uri url)
+        => await _cache.GetOrAddAsync(
+            GetImageKey(url),
+            async () =>
+            {
+                if (url.IsFile)
+                {
+                    return await File.ReadAllBytesAsync(url.LocalPath);
+                }
+
+                using var http = _httpFactory.CreateClient();
+                var bytes = await http.GetByteArrayAsync(url);
+                return bytes;
+            },
+            expiry: TimeSpan.FromHours(48));
+
+    private async Task<byte[]?> GetRandomImageDataAsync(Uri[] urls)
+    {
+        if (urls.Length == 0)
+            return null;
+
+        var url = urls[_rng.Next(0, urls.Length)];
+
+        var data = await GetImageDataAsync(url);
+        return data;
+    }
+
+    public Task<byte[]?> GetHeadsImageAsync()
+        => GetRandomImageDataAsync(_ic.Data.Coins.Heads);
+
+    public Task<byte[]?> GetTailsImageAsync()
+        => GetRandomImageDataAsync(_ic.Data.Coins.Tails);
+
+    public Task<byte[]?> GetCurrencyImageAsync()
+        => GetRandomImageDataAsync(_ic.Data.Currency);
+
+    public Task<byte[]?> GetXpBackgroundImageAsync()
+        => GetImageDataAsync(_ic.Data.Xp.Bg);
+
+    public Task<byte[]?> GetDiceAsync(int num)
+        => GetImageDataAsync(_ic.Data.Dice[num]);
+
+    public Task<byte[]?> GetSlotEmojiAsync(int number)
+        => GetImageDataAsync(_ic.Data.Slots.Emojis[number]);
+
+    public Task<byte[]?> GetSlotBgAsync()
+        => GetImageDataAsync(_ic.Data.Slots.Bg);
+}