Solver and functional extensions

[bwohlberg]

• New solvers for vectorized solution of scalar root finding and minimization problems.
• New Huber norm and set distance functionals.
• Some restructuring of functionals tests.

[codecov]

Codecov Report

Merging #264 (ba90718) into main (63ea350) will increase coverage by 0.13%.
The diff coverage is 98.96%.

@@            Coverage Diff             @@
##             main     #264      +/-   ##
==========================================
+ Coverage   93.61%   93.75%   +0.13%     
==========================================
  Files          49       50       +1     
  Lines        3541     3636      +95     
==========================================
+ Hits         3315     3409      +94     
- Misses        226      227       +1     

Flag	Coverage Δ
unittests	93.75% <98.96%> (+0.13%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
scico/functional/_indicator.py	100.00% <ø> (ø)
scico/solver.py	98.51% <97.82%> (-0.36%)	⬇️
scico/functional/__init__.py	100.00% <100.00%> (ø)
scico/functional/_dist.py	100.00% <100.00%> (ø)
scico/functional/_norm.py	100.00% <100.00%> (ø)

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