Use poetry and add formatting utils

[simlmx]

• Use poetry to manage dependencies.
• Add black and isort and a script to run them.
• Run those on the codebase (the is the only thing that changes in the python code).

[codecov-commenter]

Codecov Report

Merging #55 (aa710ac) into main (dd4e862) will not change coverage. The diff coverage is 100.00%.

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@@           Coverage Diff           @@
##             main      #55   +/-   ##
=======================================
  Coverage   48.81%   48.81%           
=======================================
  Files           6        6           
  Lines         295      295           
=======================================
  Hits          144      144           
  Misses        151      151           

Impacted Files	Coverage Δ
pvconsumer/app.py	34.52% <ø> (ø)
pvconsumer/pv_systems.py	64.70% <ø> (ø)
pvconsumer/__init__.py	100.00% <100.00%> (ø)

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