[#21] Client: Allows multinenant client

Using one client for several owners

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

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

@@ -0,0 +1,50 @@
+using System;
+using System.Collections.Generic;
+using System.Security.Cryptography;
+using System.Threading;
+using FrostFS.SDK.ModelsV2;
+using FrostFS.SDK.Cryptography;
+using Google.Protobuf;
+using Grpc.Core.Interceptors;
+
+namespace FrostFS.SDK.ClientV2;
+
+public class Context()
+{
+    private List<Interceptor>? interceptors;
+
+    private ByteString publicKeyCache;
+
+    public ECDsa Key { get; set; }
+
+    public OwnerId OwnerId { get; set; }
+
+    public ModelsV2.Version Version { get; set; }
+
+    public CancellationToken CancellationToken { get; set; } = default;
+    
+    public TimeSpan Timeout { get; set; } = default;
+    
+    public DateTime? Deadline => Timeout.Ticks > 0 ? DateTime.UtcNow.Add(Timeout) : null;
+
+    public Action<CallStatistics>? Callback { get; set; }
+
+    public List<Interceptor> Interceptors
+    {
+        get { return this.interceptors ??= []; }
+        set { this.interceptors = value; }
+    }
+
+    public ByteString PublicKeyCache 
+    { 
+        get
+        {
+            if (publicKeyCache == null)
+            {
+                publicKeyCache = ByteString.CopyFrom(Key.PublicKey());
+            }
+
+            return publicKeyCache;
+        }
+    }
+}