initial lsmr draft

[maartenvd]

Initial implementation of lsmr. There are no tests yet, and some parts can be cleaned up.

[codecov]

Codecov Report

Merging #46 (a6005d5) into master (4e2b5e2) will increase coverage by 1.95%.
The diff coverage is 93.38%.

@@            Coverage Diff             @@
##           master      #46      +/-   ##
==========================================
+ Coverage   77.45%   79.40%   +1.95%     
==========================================
  Files          23       24       +1     
  Lines        2355     2462     +107     
==========================================
+ Hits         1824     1955     +131     
+ Misses        531      507      -24     

Impacted Files	Coverage Δ
src/KrylovKit.jl	46.42% <ø> (-0.24%)	⬇️
src/linsolve/lsmr.jl	93.04% <93.04%> (ø)
src/algorithms.jl	80.00% <100.00%> (+1.73%)	⬆️
src/krylov/gkl.jl	86.84% <100.00%> (+11.18%)	⬆️
src/dense/givens.jl	50.00% <0.00%> (-2.64%)	⬇️
src/dense/linalg.jl	82.51% <0.00%> (+0.42%)	⬆️
src/orthonormal.jl	92.01% <0.00%> (+0.46%)	⬆️
src/recursivevec.jl	42.59% <0.00%> (+0.77%)	⬆️
... and 5 more

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