[#24] Client: Implement pool part1

first iteration - base classes and methods

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

src/FrostFS.SDK.ClientV2/Tools/EnvironmentContext.cs

@@ -0,0 +1,48 @@
+using System;
+using System.Buffers;
+using System.Security.Cryptography;
+
+using Grpc.Net.Client;
+
+namespace FrostFS.SDK.ClientV2;
+
+public class EnvironmentContext(FrostFSClient client, ECDsa? key, FrostFsOwner? owner, GrpcChannel channel, FrostFsVersion version) : IDisposable
+{
+    private ArrayPool<byte>? _arrayPool;
+
+    internal FrostFsOwner? Owner { get; } = owner;
+
+    internal GrpcChannel Channel { get; private set; } = channel;
+
+    internal FrostFsVersion Version { get; } = version;
+
+    internal NetworkSettings? NetworkSettings { get; set; }
+
+    internal FrostFSClient Client { get; } = client;
+
+    internal ClientKey? Key { get; } = key != null ? new ClientKey(key) : null;
+
+    /// <summary>
+    /// Custom pool is used for predefined sizes of buffers like grpc chunk 
+    /// </summary>
+    internal ArrayPool<byte> GetArrayPool(int size)
+    {
+        _arrayPool ??= ArrayPool<byte>.Create(size, 256);
+
+        return _arrayPool;
+    }
+
+    public void Dispose()
+    {
+        Dispose(true);
+        GC.SuppressFinalize(this);
+    }
+
+    protected virtual void Dispose(bool disposing)
+    {
+        if (disposing)
+        {
+            Channel?.Dispose();
+        }
+    }
+}