Handle cancellation token during the consumer close

[Gsantomaggio]

• During the handle delivery, the consumer could receive a Token cancellation
  In this commit, the consumer handles it with a log and exit. It will avoid
  propagating the error and close the TCP connection

• Add a lock around the IsOpen() function to make it thread-safe.
  In normal situations, it does not matter. It is useful when a consumer is
  created and destroyed in a short time

• Handle the Subscribe error. In case there is an error during the init.
  The error will be raised to the caller, but the pool must be consistent.

Found the issue with a caos test like:

for (var z = 0; z < 800; z++)
        {
            Console.WriteLine($"Starting consumer test {z}");
            await Task.Delay(new Random().Next(100, 200));
            try
            {
                var tcs = new TaskCompletionSource(TaskCreationOptions.RunContinuationsAsynchronously);

                var consumer = await _streamSystem.CreateConsumer($"consumer-thread-force-test_{z}",
                    async (_, consumer, arg3, arg4) =>
                    {
                        tcs.TrySetResult();
                        await Task.CompletedTask;
                    }
                        
                );

                await tcs.Task.ConfigureAwait(false);
                _ = Task.Run(async () =>
                {
                    await Task.Delay(new Random().Next(500, 800));
                    await consumer.Close();
                });
            }
            catch (Exception e)
            {
                Console.WriteLine($"Error creating consumer {e.Message}");
            }
        }

[codecov]

Codecov Report

Attention: 91 lines in your changes are missing coverage. Please review.

Comparison is base (4601429) 92.49% compared to head (ae0ea1c) 92.76%.
Report is 4 commits behind head on main.

❗ Current head ae0ea1c differs from pull request most recent head 9edd363. Consider uploading reports for the commit 9edd363 to get more accurate results

Files	Patch %	Lines
RabbitMQ.Stream.Client/RawConsumer.cs	81.94%	22 Missing and 4 partials ⚠️
RabbitMQ.Stream.Client/Client.cs	87.02%	7 Missing and 10 partials ⚠️
RabbitMQ.Stream.Client/Reliable/Producer.cs	56.66%	9 Missing and 4 partials ⚠️
RabbitMQ.Stream.Client/AbstractEntity.cs	78.18%	9 Missing and 3 partials ⚠️
RabbitMQ.Stream.Client/ConnectionsPool.cs	90.67%	1 Missing and 10 partials ⚠️
RabbitMQ.Stream.Client/ClientExceptions.cs	60.00%	5 Missing and 1 partial ⚠️
RabbitMQ.Stream.Client/RawProducer.cs	97.01%	2 Missing ⚠️
RabbitMQ.Stream.Client/StreamSystem.cs	90.47%	0 Missing and 2 partials ⚠️
RabbitMQ.Stream.Client/MetaData.cs	66.66%	0 Missing and 1 partial ⚠️
Tests/SuperStreamConsumerTests.cs	95.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #339      +/-   ##
==========================================
+ Coverage   92.49%   92.76%   +0.26%     
==========================================
  Files         113      116       +3     
  Lines        9946    10994    +1048     
  Branches      825      901      +76     
==========================================
+ Hits         9200    10199     +999     
- Misses        567      600      +33     
- Partials      179      195      +16     

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