Add GLM.DensePredQR

[getzze]

• use linter
• improve *PredCG
• improve tests

[codecov]

Codecov Report

Patch coverage: 75.10% and project coverage change: -1.09 ⚠️

Comparison is base (0be4707) 85.20% compared to head (87db13a) 84.12%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #35      +/-   ##
==========================================
- Coverage   85.20%   84.12%   -1.09%     
==========================================
  Files          11       12       +1     
  Lines        1724     1776      +52     
==========================================
+ Hits         1469     1494      +25     
- Misses        255      282      +27     

Impacted Files	Coverage Δ
src/RobustModels.jl	66.66% <ø> (ø)
src/compat.jl	0.00% <0.00%> (ø)
src/deprecated.jl	44.44% <ø> (ø)
src/estimators.jl	72.09% <0.00%> (ø)
src/losses.jl	85.23% <25.00%> (+1.11%)	⬆️
src/linpred.jl	79.62% <71.42%> (-3.21%)	⬇️
src/regularizedpred.jl	71.42% <71.42%> (ø)
src/robustlinearmodel.jl	87.63% <81.53%> (-1.65%)	⬇️
src/tools.jl	87.05% <90.90%> (-0.45%)	⬇️
src/linresp.jl	81.77% <100.00%> (-1.14%)	⬇️
... and 2 more

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