Reduce compile time

[janosg]

Second attempt at reducing compile time

• Use jnp.where to handle missings in update
• Get rid of pandas objects in likelihood function
• Use cond instead of if conditions
• Use scan instead of a for loop

[codecov-commenter]

Codecov Report

Merging #65 (5a4f878) into main (b17ce92) will decrease coverage by 0.26%.
The diff coverage is 92.61%.

@@            Coverage Diff             @@
##             main      #65      +/-   ##
==========================================
- Coverage   92.83%   92.57%   -0.27%     
==========================================
  Files          28       27       -1     
  Lines        2163     2194      +31     
==========================================
+ Hits         2008     2031      +23     
- Misses        155      163       +8     

Impacted Files	Coverage Δ
skillmodels/simulate_data.py	86.88% <ø> (ø)
skillmodels/tests/test_params_index.py	100.00% <ø> (ø)
skillmodels/likelihood_function.py	84.35% <80.70%> (-3.36%)	⬇️
skillmodels/kalman_filters.py	100.00% <100.00%> (ø)
skillmodels/params_index.py	100.00% <100.00%> (ø)
skillmodels/parse_params.py	95.34% <100.00%> (-2.36%)	⬇️
skillmodels/process_data.py	94.59% <100.00%> (ø)
skillmodels/tests/test_kalman_filters.py	99.32% <100.00%> (+0.09%)	⬆️
skillmodels/tests/test_likelihood_regression.py	98.33% <100.00%> (ø)
skillmodels/tests/test_parse_params.py	100.00% <100.00%> (ø)
... and 5 more

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