Implement NGC service (#5681)

* Implement NGC service

* Use raw byte arrays instead of string for _wordSeparators

* Silence IDE0230 for _wordSeparators

* Try to silence warning about _rangeValuesCount not being read on SparseSet

* Make AcType enum private

* Add abstract methods and one TODO that I forgot

* PR feedback

* More PR feedback

* More PR feedback

src/Ryujinx.Horizon/Sdk/Fs/FileHandle.cs

@@ -0,0 +1,13 @@
+
+namespace Ryujinx.Horizon.Sdk.Fs
+{
+    public readonly struct FileHandle
+    {
+        public object Value { get; }
+
+        public FileHandle(object value)
+        {
+            Value = value;
+        }
+    }
+}