refactor: move _precition_mv_normal_logp into a seperate function#7895

Michal-Novomestsky wants to merge 2 commits intopymc-devs:mainpymc-devs/pymc:mainfrom

Michal-Novomestsky:Refactor-Make-precision_mv_normal_logp-a-general-purpose-functionMichal-Novomestsky/pymc:Refactor-Make-precision_mv_normal_logp-a-general-purpose-functionCopy head branch name to clipboard