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[bot]]

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 :warning:
RabbitMQ.Stream.Client/DeleteSuperStream.cs	89.65%	3 Missing :warning:
RabbitMQ.Stream.Client/StreamSpec.cs	95.23%	2 Missing and 1 partial :warning:
RabbitMQ.Stream.Client/StreamSystem.cs	88.23%	1 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ 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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