Didn't find another way to pull ESS than using posterior

I think we also need parameters filtering

I think we also need parameters filtering

Oh, it's already there I saw.

There are a lot of RD-files changed, but that's no problem right now. You said you'd prefer "simple" argument options, so I just kept the main option. We can now leave all the checks for the argument to the insight functions, and furthermore, we thereby also allow all options that are supported in insight (which might have been more there than here in bayestestR).

Furthermore, posterior also works for stanreg, so the functions simply differ in their default options, but then the stanreg method just calls the brms method.

We can then later revise all the other bayestestR methods, and only have one option for the effects and the component argument, and again do all the checks for valid options in insight, this simplifies the code and the docs.

Codecov Report

Attention: Patch coverage is 59.09091% with 9 lines in your changes missing coverage. Please review.

Project coverage is 54.51%. Comparing base (22b9801) to head (87b76cd).
Report is 1 commits behind head on main.

@@            Coverage Diff             @@
##             main     #705      +/-   ##
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- Coverage   54.56%   54.51%   -0.05%     
==========================================
  Files          64       64              
  Lines        5947     5932      -15     
==========================================
- Hits         3245     3234      -11     
+ Misses       2702     2698       -4     

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