Add SmoothLassoLS method

[deepanshs]

Optimize alpha and lambda hyperparameters using least-squares analysis.

[codecov]

Codecov Report

Merging #5 (3ad7be6) into master (11c8d90) will decrease coverage by 1.70%.
The diff coverage is 85.03%.

@@            Coverage Diff             @@
##           master       #5      +/-   ##
==========================================
- Coverage   95.72%   94.01%   -1.71%     
==========================================
  Files          19       19              
  Lines         889     1003     +114     
==========================================
+ Hits          851      943      +92     
- Misses         38       60      +22     

Impacted Files	Coverage Δ
mrinversion/kernel/csa_aniso.py	100.00% <ø> (ø)
mrinversion/linear_model/smooth_lasso.py	85.00% <78.57%> (-15.00%)	⬇️
mrinversion/linear_model/_base_l1l2.py	85.71% <82.84%> (-2.39%)	⬇️
mrinversion/__init__.py	100.00% <100.00%> (ø)
mrinversion/kernel/base.py	98.05% <100.00%> (-0.02%)	⬇️
mrinversion/kernel/relaxation.py	100.00% <100.00%> (ø)
mrinversion/kernel/tests/other_kernel_test.py	100.00% <100.00%> (ø)
mrinversion/kernel/utils.py	91.93% <100.00%> (ø)
mrinversion/linear_model/__init__.py	100.00% <100.00%> (ø)
mrinversion/linear_model/tsvd_compression.py	100.00% <100.00%> (ø)
... and 2 more

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