[#26] All: Remove V2 from naming

Rename project, namespaces and class names

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

src/FrostFS.SDK.ClientV2/Parameters/ISessionToken.cs

@@ -1,12 +0,0 @@
-namespace FrostFS.SDK.ClientV2;
-
-public interface ISessionToken
-{
-    /// <summary>
-    /// Object represents token of the FrostFS Object session. A session is opened between any two sides of the
-    /// system, and implements a mechanism for transferring the power of attorney of actions to another network
-    /// member. The session has a limited validity period, and applies to a strictly defined set of operations.
-    /// </summary>
-    /// <value>Instance of the session obtained from the server</value> 
-    FrostFsSessionToken? SessionToken { get; set; }
-}