Restart Wrappers & Separable CMA-ES

[RobertTLange]

• Adds a base Restart Wrapper, a simple reinit and a non-jittable BIPOP (interlaced small/large population size) wrapper for restarting.
• Adds a Separable CMA-ES strategy (tested on Rosenbrock and CartPole-MLP), which works with a diagonal covariance matrix. This circumvents an expensive eigendecomposition at the cost of ignoring dimension dependencies.

[RobertTLange]

Codecov Report

Merging #4 (184b534) into main (bd36e98) will increase coverage by 1.43%. The diff coverage is 98.26%.

@@            Coverage Diff             @@
##             main       #4      +/-   ##
==========================================
+ Coverage   87.89%   89.32%   +1.43%     
==========================================
  Files          32       38       +6     
  Lines        1437     1667     +230     
==========================================
+ Hits         1263     1489     +226     
- Misses        174      178       +4     

Impacted Files	Coverage Δ
evosax/__init__.py	100.00% <ø> (ø)
evosax/problems/control_brax.py	87.91% <ø> (ø)
evosax/problems/control_gym.py	90.27% <ø> (ø)
evosax/problems/supervised.py	57.40% <ø> (ø)
evosax/utils/reshape_params.py	79.72% <ø> (ø)
evosax/restarts/restarter.py	93.10% <93.10%> (ø)
evosax/restarts/__init__.py	100.00% <100.00%> (ø)
evosax/restarts/bipop_restart.py	100.00% <100.00%> (ø)
evosax/restarts/simple_restart.py	100.00% <100.00%> (ø)
evosax/restarts/termination.py	100.00% <100.00%> (ø)
... and 13 more