[#24] Client: Implement pool part1

first iteration - base classes and methods

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

src/FrostFS.SDK.ClientV2/Poll/InitParameters.cs

@@ -0,0 +1,34 @@
+using System;
+using System.Security.Cryptography;
+
+using Microsoft.Extensions.Logging;
+
+namespace FrostFS.SDK.ClientV2;
+
+// InitParameters contains values used to initialize connection Pool.
+public class InitParameters
+{
+    public ECDsa? Key { get; set; }
+
+    public ulong NodeDialTimeout { get; set; }
+
+    public ulong NodeStreamTimeout { get; set; }
+
+    public ulong HealthcheckTimeout { get; set; }
+
+    public ulong ClientRebalanceInterval { get; set; }
+
+    public ulong SessionExpirationDuration { get; set; }
+
+    public uint ErrorThreshold { get; set; }
+
+    public NodeParam[]? NodeParams { get; set; }
+
+    public DialOptions[]? DialOptions { get; set; }
+
+    public Func<string, ClientWrapper>? ClientBuilder { get; set; }
+
+    public ulong GracefulCloseOnSwitchTimeout { get; set; }
+
+    public ILogger? Logger { get; set; }
+}