Add type hints and mypy check

[tlambert03]

This adds type hints for most of the library, and adds a mypy check.

For the moment, I have left on allow_untyped_defs=true ... and typing can be added incrementally

You can feel free to relax the type checking later if you want to (do it by either removing mypy from the pre-commit config yaml, or by setting mypy.strict = false in pyproject.toml

[codecov-commenter]

Codecov Report

Merging #5 (81dece1) into main (dccb78d) will decrease coverage by 2.12%. The diff coverage is 85.44%.

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@@            Coverage Diff             @@
##             main       #5      +/-   ##
==========================================
- Coverage   87.76%   85.64%   -2.12%     
==========================================
  Files          27       27              
  Lines         523      613      +90     
==========================================
+ Hits          459      525      +66     
- Misses         64       88      +24     

Impacted Files	Coverage Δ
motile/utils.py	0.00% <0.00%> (ø)
motile/costs/edge_distance.py	50.00% <62.50%> (+3.33%)	:arrow_up:
motile/constraints/constraint.py	77.77% <71.42%> (-2.23%)	:arrow_down:
motile/constraints/select_edge_nodes.py	96.00% <80.00%> (-4.00%)	:arrow_down:
motile/costs/costs.py	77.77% <80.00%> (-2.23%)	:arrow_down:
motile/ssvm.py	80.95% <80.00%> (-1.41%)	:arrow_down:
motile/solver.py	91.00% <81.48%> (-3.57%)	:arrow_down:
motile/constraints/max_children.py	95.23% <83.33%> (-4.77%)	:arrow_down:
motile/constraints/max_parents.py	95.23% <83.33%> (-4.77%)	:arrow_down:
motile/costs/appear.py	92.85% <83.33%> (-7.15%)	:arrow_down:
... and 16 more

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