Implement Add/Remove super stream feature

[Gsantomaggio]

Implement the super-stream creation/deletion.

There are two ways to create the super-stream:

1. Based on partitions with:

const string SuperStream = "my-first-system-super-stream";
var spec = new PartitionsSuperStreamSpec(SuperStream, 2);
await system.CreateSuperStream(spec);

2. Based on keys with:

const string SuperStream = "countries";
var system = await StreamSystem.Create(new StreamSystemConfig());
var conf = new BindingsSuperStreamSpec(SuperStream, new[] { "italy", "france", "spain", "germany", "uk" });
await system.CreateSuperStream(conf);

[codecov]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (335a0f3) 92.35% compared to head (6abf247) 92.10%.

Files	Patch %	Lines
RabbitMQ.Stream.Client/CreateSuperStream.cs	95.00%	3 Missing ⚠️
RabbitMQ.Stream.Client/DeleteSuperStream.cs	89.65%	3 Missing ⚠️
RabbitMQ.Stream.Client/StreamSpec.cs	95.23%	2 Missing and 1 partial ⚠️
RabbitMQ.Stream.Client/StreamSystem.cs	88.23%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #357      +/-   ##
==========================================
- Coverage   92.35%   92.10%   -0.26%     
==========================================
  Files         116      118       +2     
  Lines       11738    12021     +283     
  Branches      915      927      +12     
==========================================
+ Hits        10841    11072     +231     
- Misses        690      734      +44     
- Partials      207      215       +8     

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