Switch tooling to hatch

[goerz]

Closes #117

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[codecov]

Codecov Report

Attention: Patch coverage is 77.77778% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 95.9%. Comparing base (e9bad00) to head (0cd4978).

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #120     +/-   ##
========================================
- Coverage    96.1%   95.9%   -0.2%     
========================================
  Files          13      13             
  Lines        1677    1685      +8     
========================================
+ Hits         1612    1617      +5     
- Misses         65      68      +3     

Files	Coverage Δ
src/krotov/convergence.py	96.0% <ø> (ø)
src/krotov/info_hooks.py	94.6% <ø> (ø)
src/krotov/objectives.py	97.2% <ø> (ø)
src/krotov/optimize.py	97.6% <ø> (ø)
src/krotov/result.py	92.5% <77.7%> (-1.5%)	⬇️

... and 1 file with indirect coverage changes

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