NonlinearLeastSquaresProblem Solvers: Levenberg & Gauss Newton

[avik-pal]

• Wait on Add NonlinearLeastSquaresProblem SciMLBase.jl#500
• Wait on Add NonlinearLeastSquaresProblem dispatches DiffEqBase.jl#933
• Levenberg
• Gauss Newton
• Tests
• Look into how convergence checks are implemented in other libraries

[codecov]

Codecov Report

Merging #218 (9a579c8) into master (cc04a70) will increase coverage by 93.75%.
The diff coverage is 85.58%.

@@             Coverage Diff             @@
##           master     #218       +/-   ##
===========================================
+ Coverage    0.00%   93.75%   +93.75%     
===========================================
  Files           8        9        +1     
  Lines         775      832       +57     
===========================================
+ Hits            0      780      +780     
+ Misses        775       52      -723     

Files	Coverage Δ
src/NonlinearSolve.jl	89.47% <100.00%> (+89.47%)	⬆️
src/levenberg.jl	98.42% <100.00%> (+98.42%)	⬆️
src/raphson.jl	100.00% <ø> (+100.00%)	⬆️
src/trustRegion.jl	99.35% <100.00%> (+99.35%)	⬆️
src/utils.jl	78.40% <100.00%> (+78.40%)	⬆️
src/jacobian.jl	88.52% <88.88%> (+88.52%)	⬆️
src/gaussnewton.jl	75.00% <75.00%> (ø)

... and 2 files with indirect coverage changes

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[avik-pal]

This is ready for merge!