Doc/cyclic symmetry

[roosre]

Add an example to demonstrate that pyDPF Composites can be used for results of cyclic symmetry analyses as well.

While playing with the cyclic symmetry model and going through the DPF Core examples, I figured out that the RST streams provider is often used. Therefore, I thought it makes sense to expose it through a method. Let me know if you have objections.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 91.62%. Comparing base (e44f311) to head (5474d85).

Files with missing lines	Patch %	Lines
...sys/dpf/composites/_composite_model_impl_2023r2.py	50.00%	1 Missing ⚠️
src/ansys/dpf/composites/composite_model.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #517      +/-   ##
==========================================
- Coverage   91.66%   91.62%   -0.05%     
==========================================
  Files          50       50              
  Lines        3397     3401       +4     
==========================================
+ Hits         3114     3116       +2     
- Misses        283      285       +2     

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