[#26] All: Remove V2 from naming

Rename project, namespaces and class names

Signed-off-by: Pavel Gross <p.gross@yadro.com>

src/FrostFS.SDK.Client/Mappers/Session/SessionMapper.cs

@@ -0,0 +1,28 @@
+using System;
+
+using Google.Protobuf;
+
+namespace FrostFS.SDK.Client;
+
+public static class SessionMapper
+{
+    public static byte[] Serialize(this Session.SessionToken token)
+    {
+        if (token is null)
+        {
+            throw new ArgumentNullException(nameof(token));
+        }
+
+        byte[] bytes = new byte[token.CalculateSize()];
+        using CodedOutputStream stream = new(bytes);
+        token.WriteTo(stream);
+
+        return bytes;
+    }
+
+    public static Session.SessionToken Deserialize(this Session.SessionToken token, byte[] bytes)
+    {
+        token.MergeFrom(bytes);
+        return token;
+    }
+}