Add black and isort

[drhagen]

This was added via Ruff, obviously. This also changed the line length to 99 to follow the Python blueprint.

[codecov-commenter]

Codecov Report

Merging #15 (e1695ab) into master (bfb8100) will not change coverage.
The diff coverage is 87.16%.

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@@           Coverage Diff           @@
##           master      #15   +/-   ##
=======================================
  Coverage   89.68%   89.68%           
=======================================
  Files          10       10           
  Lines         756      756           
  Branches      171      171           
=======================================
  Hits          678      678           
  Misses         39       39           
  Partials       39       39           

Files	Coverage Δ
src/tensora/__init__.py	100.00% <100.00%> (ø)
src/tensora/expression/ast.py	100.00% <100.00%> (ø)
src/tensora/expression/parser.py	100.00% <100.00%> (ø)
src/tensora/format/__init__.py	100.00% <100.00%> (ø)
src/tensora/format/format.py	100.00% <100.00%> (ø)
src/tensora/format/parser.py	96.42% <100.00%> (ø)
src/tensora/tensor.py	91.61% <96.82%> (ø)
src/tensora/function.py	76.31% <62.50%> (ø)
src/tensora/compile.py	79.74% <76.78%> (ø)

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