Add Weibull

[edknock]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 28 lines in your changes missing coverage. Please review.

Project coverage is 99.11%. Comparing base (7e2ae12) to head (8832c17).

Files with missing lines	Patch %	Lines
src/random_legacy.cpp	0.00%	16 Missing ⚠️
inst/include/monty/random/weibull.hpp	0.00%	11 Missing ⚠️
R/rng.R	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #119      +/-   ##
==========================================
- Coverage   99.59%   99.11%   -0.49%     
==========================================
  Files          73       74       +1     
  Lines        5711     5739      +28     
==========================================
  Hits         5688     5688              
- Misses         23       51      +28     

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