Add super stream exists API

[Gsantomaggio]

• Add documentation
• Add configuration to BestPracticesClient client

[codecov[bot]]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (ac23f56) 92.08% compared to head (65239bc) 92.05%.

Files	Patch %	Lines
RabbitMQ.Stream.Client/Client.cs	50.00%	3 Missing and 2 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #358 +/- ## ========================================== - Coverage 92.08% 92.05% -0.03% ========================================== Files 118 118 Lines 12021 12046 +25 Branches 927 929 +2 ========================================== + Hits 11069 11089 +20 - Misses 739 742 +3 - Partials 213 215 +2 ```

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