Add: kurtosis and skewness, Fix: piracy to piracies

[codecov[bot]]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (65b1623) 79.77% compared to head (3b49308) 80.15%. Report is 2 commits behind head on main.

Files	Patch %	Lines
...stributions/normal_family/normal_mean_precision.jl	70.00%	3 Missing :warning:
...ns/normal_family/normal_weighted_mean_precision.jl	0.00%	2 Missing :warning:
src/distributions/gamma_family/gamma_shape_rate.jl	88.88%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #175 +/- ## ========================================== + Coverage 79.77% 80.15% +0.38% ========================================== Files 39 39 Lines 2887 2897 +10 ========================================== + Hits 2303 2322 +19 + Misses 584 575 -9 ```

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