Adds `Wishart` and `InverseWishart` distributions#170

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egordm wants to merge 11 commits intostatrs-dev:masterfrom

egordm:feature/wishart

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
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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
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Commits on Sep 17, 2022

Commits on Sep 19, 2022

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