Make taiko use namespaced hitsounds

This is a temporary solution for now that uses DrawableHitObject.SampleNamespace for the override. We will not want to do this going forward, and instead have the rulesets add their custom resource stores to the games', but that requires deciding where/when to apply/remove such resource stores, and is probably left to skinning.

osu.Game.Rulesets.Taiko/Objects/Drawables/DrawableTaikoHitObject.cs

@@ -41,6 +41,8 @@ namespace osu.Game.Rulesets.Taiko.Objects.Drawables
         // Normal and clap samples are handled by the drum
         protected override IEnumerable<SampleInfo> GetSamples() => HitObject.Samples.Where(s => s.Name != SampleInfo.HIT_NORMAL && s.Name != SampleInfo.HIT_CLAP);
 
+        protected override string SampleNamespace => "Taiko";
+
         protected virtual TaikoPiece CreateMainPiece() => new CirclePiece();
 
         public abstract bool OnPressed(TaikoAction action);