Add Producer/Consumer Identifier

[Gsantomaggio]

The Identifier helps to correlate the entities with the logs and the UI.

Add the Identifier for producer and consumer. For the consumer is visible in the UI, like:

Code:

var producer = await Producer.Create(new ProducerConfig(system, stream)
{
   Identifier = $"my_producer_99",
                   

logs:

 ProducerInfo(Stream=my_stream, Reference=, Identifier=my_producer_99)

Note: The producer doesn't have custom properties so won't be showed on the UI.

[codecov]

Codecov Report

Attention: 10 lines in your changes are missing coverage. Please review.

Comparison is base (fa8f66b) 92.12% compared to head (e26dbae) 92.12%.

❗ Current head e26dbae differs from pull request most recent head b946c81. Consider uploading reports for the commit b946c81 to get more accurate results

Files	Patch %	Lines
RabbitMQ.Stream.Client/StreamSystem.cs	85.71%	0 Missing and 5 partials ⚠️
RabbitMQ.Stream.Client/IProducer.cs	25.00%	3 Missing ⚠️
RabbitMQ.Stream.Client/IConsumer.cs	50.00%	1 Missing ⚠️
RabbitMQ.Stream.Client/RawSuperStreamConsumer.cs	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #348      +/-   ##
==========================================
- Coverage   92.12%   92.12%   -0.01%     
==========================================
  Files         116      116              
  Lines       11320    11366      +46     
  Branches      897      899       +2     
==========================================
+ Hits        10429    10471      +42     
- Misses        687      689       +2     
- Partials      204      206       +2     

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