[#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/MetaHeader.cs

@@ -0,0 +1,23 @@
+using System;
+
+using FrostFS.Session;
+
+namespace FrostFS.SDK.Client.Mappers.GRPC;
+
+public static class MetaHeaderMapper
+{
+    public static RequestMetaHeader ToMessage(this MetaHeader metaHeader)
+    {
+        if (metaHeader is null)
+        {
+            throw new ArgumentNullException(nameof(metaHeader));
+        }
+
+        return new RequestMetaHeader
+        {
+            Version = metaHeader.Version.ToMessage(),
+            Epoch = (uint)metaHeader.Epoch,
+            Ttl = (uint)metaHeader.Ttl
+        };
+    }
+}