Added circular ensembles

[czgdp1807]

References to other Issues or PRs

Brief description of what is fixed or changed

Circular ensembles have been added.

Other comments

More features will be added, if possible.
@Upabjojr @sidhantnagpal I am facing a problem(well the last option will be to keep it unevaluated) in exactly defining the density, since it is based on Haar measure which is not unique. Please let me know of any thing available in the literature so that I can do some improvements. I am also right now doing some searching on Google.

Release Notes

• stats
  • Circular ensembles have been added in sympy.stats.

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• stats
  • Circular ensembles have been added in sympy.stats. (#17304 by @czgdp1807)

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#### Brief description of what is fixed or changed
Circular ensembles have been added.

#### Other comments
More features will be added, if possible.
@Upabjojr @sidhantnagpal I am facing a problem(well the last option will be to keep it unevaluated) in exactly defining the density, since it is based on Haar measure which is not unique. Please let me know of any thing available in the literature so that I can do some improvements. I am also right now doing some searching on Google.

#### Release Notes

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* stats
  * Circular ensembles have been added in `sympy.stats`.
<!-- END RELEASE NOTES -->

Update

The release notes on the wiki have been updated.

[codecov]

Codecov Report

Merging #17304 into master will increase coverage by 0.058%.
The diff coverage is 96%.

@@              Coverage Diff              @@
##            master    #17304       +/-   ##
=============================================
+ Coverage   74.689%   74.747%   +0.058%     
=============================================
  Files          631       631               
  Lines       163223    163515      +292     
  Branches     38294     38362       +68     
=============================================
+ Hits        121911    122224      +313     
+ Misses       35974     35943       -31     
- Partials      5338      5348       +10

[czgdp1807]

@Upabjojr @sidhantnagpal I am facing a problem(well the last option will be to keep it unevaluated) in exactly defining the density, since it is based on Haar measure which is not unique. Please let me know of any thing available in the literature so that I can do some improvements. I am also right now doing some searching on Google.

@jksuom Any comments on this. I don't know much about Haar measure. What I know is that it is not unique, so how can I define the density of various circular ensembles. Thanks.

[czgdp1807]

@Upabjojr The work is complete on circular ensembles.
Regarding Haar measure, I will open a separate PR in continuation of this one as predicting things on it's implementation will be difficult for now.