Implement dims.Weibull

[ricardoV94]

Related to #7874

Needed for pymc-labs/pymc-marketing#2204

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.45%. Comparing base (c868a84) to head (9586bac).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8081      +/-   ##
==========================================
- Coverage   90.89%   87.45%   -3.44%     
==========================================
  Files         123      123              
  Lines       19489    19519      +30     
==========================================
- Hits        17714    17070     -644     
- Misses       1775     2449     +674     

Files with missing lines	Coverage Δ
pymc/dims/distributions/core.py	90.90% <100.00%> (+0.90%)	⬆️
pymc/dims/distributions/scalar.py	96.53% <100.00%> (+0.25%)	⬆️
pymc/logprob/basic.py	96.35% <100.00%> (-3.65%)	⬇️

... and 22 files with indirect coverage changes

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