Support seeking past the end of a file

Author: SpaceCheetah

LiteDB/Client/Storage/LiteFileStream.Read.cs

@@ -10,6 +10,9 @@ public partial class LiteFileStream<TFileId> : Stream
         public override int Read(byte[] buffer, int offset, int count)
         {
             if (_mode != FileAccess.Read) throw new NotSupportedException();
+            if (_streamPosition == Length) {
+                return 0;
+            }
 
             var bytesLeft = count;
 
@@ -51,10 +54,14 @@ private byte[] GetChunkData(int index)
 
         private void SetReadStreamPosition(long newPosition)
         {
-            if (newPosition < 0 || newPosition > Length)
+            if (newPosition < 0)
             {
                 throw new ArgumentOutOfRangeException();
             }
+            if (newPosition >= Length) {
+                _streamPosition = Length;
+                return;
+            }
             _streamPosition = newPosition;
 
             // calculate new chunk position