Adds `Wishart` and `InverseWishart` distributions#170

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egordm wants to merge 11 commits intostatrs-dev:masterfrom egordm:feature/wishart

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Commits on Jul 5, 2022

feat: Added implementation for multivariate gamma function mvgamma and its log variant mvlgamma
egordm
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feat: Added implementation for Wishart distribution
egordm
committed

Commits on Jul 7, 2022

fix: Updated inverse wishart sampling to make the matrix symmetric as pseudo inverse doesn't do this due to approximation
egordm
committed

Commits on Sep 17, 2022

Commits on Sep 19, 2022

fix: Updted inverse wishart to compute chol inverse instead of an approximation
egordm
committed