More Steps: adds additional *_step methods

[cgarciae]

Changes

Model

• Refactors _jit_functions as jit_step
• Refactors base_states as states_step
• Implements init_step + init.

Module

• Implements init_or_apply

[codecov-io]

Codecov Report

Merging #163 (2754bc2) into master (5e13e1b) will decrease coverage by 0.07%.
The diff coverage is 80.85%.

@@            Coverage Diff             @@
##           master     #163      +/-   ##
==========================================
- Coverage   84.87%   84.80%   -0.08%     
==========================================
  Files         131      131              
  Lines        6858     6879      +21     
==========================================
+ Hits         5821     5834      +13     
- Misses       1037     1045       +8     

Impacted Files	Coverage Δ
elegy/module.py	94.31% <50.00%> (-0.90%)	⬇️
elegy/model/model_core.py	87.98% <83.33%> (-1.47%)	⬇️
elegy/model/model.py	96.41% <100.00%> (+0.01%)	⬆️
elegy/types.py	96.25% <100.00%> (+0.12%)	⬆️

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