Add nutpie support

[Y0dler]

More recent nutpie versions take initial values via the init_means argument (as opposed to initvals with the default sampler). Accordingly, nutpie can now be employed for faster sampling.

[github-actions]

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[Y0dler]

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[Y0dler]

I have read the CLA Document and I hereby sign the CLA.

[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 93.30%. Comparing base (0d9c552) to head (7cbb944).
Report is 21 commits behind head on main.

Files with missing lines	Patch %	Lines
bletl/growth.py	25.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #78      +/-   ##
==========================================
- Coverage   93.43%   93.30%   -0.14%     
==========================================
  Files          11       11              
  Lines        1219     1239      +20     
==========================================
+ Hits         1139     1156      +17     
- Misses         80       83       +3     

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[Y0dler]

I don't think that sampling is covered in test_growth.py, hence the lowered coverage.

[michaelosthege]

Out of curiosity: How much faster is the nutpie sampler in comparison?