r-keyatm r-matrixnormal r-pgdraw: init pkgs

[bshor]

Adds r-keyatm 0.5.5 and its two missing dependencies.

keyATM (Keyword Assisted Topic Models) is an R package for fitting topic models that incorporate user-provided keywords to guide topic discovery, improving interpretability over standard LDA.

Package	Version	License	Notes
r-keyatm	0.5.5	GPL-3	Keyword assisted topic models; NeedsCompilation: yes; C++17
r-matrixnormal	0.1.2	GPL-3	Matrix normal distribution
r-pgdraw	1.1	GPL (>= 3)	Polya-Gamma sampler; NeedsCompilation: yes

All other r-keyatm Imports were already in BioArchLinux. Built and verified locally via makepkg -f.