Add algorithm CMA-ME

[felixchalumeau]

Related to issue #80

Done:

• implement the improvment emitter
• implement the random emitter
• implement the opt emitter
• implement the pool of emitters
• example notebook
• check perfs of the CMA ES optimizer
• fix bug in CMA-MEGA (issue in improvment computation due to bad repertoire use)
• getting similar perfs for the improv emitter on ragistrin and sphere
• even outperforming with other params
• update documentation
• add tests

Future improvements:

• pytree genotype compatibility (add the moment, CMAES and CMAME only works for jnp.ndarray)
• check random direction performance
• check CMAMEGA performance

Notes:

• About the pool of homogeneous emitters and the scheduling rule "the emitter with the less emissions emits": quite soon, only one emitter is used, because at each reinit event, it's used until it reached the others number of emission. Plus, it's not supposed to provide any difference with having just one (considering this particular emitting rule).

[codecov-commenter]

Codecov Report

Merging #86 (d44dc76) into develop (d7c6dc7) will increase coverage by 0.46%.
The diff coverage is 97.92%.

@@             Coverage Diff             @@
##           develop      #86      +/-   ##
===========================================
+ Coverage    91.27%   91.74%   +0.46%     
===========================================
  Files           90       97       +7     
  Lines         5101     5403     +302     
===========================================
+ Hits          4656     4957     +301     
- Misses         445      446       +1     

Impacted Files	Coverage Δ
tests/baselines_test/cmamega_test.py	98.36% <ø> (ø)
tests/core_test/cmaes_test.py	93.10% <93.10%> (ø)
qdax/core/emitters/cma_emitter.py	95.89% <95.89%> (ø)
qdax/core/emitters/cma_pool_emitter.py	97.77% <97.77%> (ø)
tests/baselines_test/cmame_test.py	98.46% <98.46%> (ø)
qdax/core/cmaes.py	98.19% <100.00%> (+8.58%)	⬆️
qdax/core/emitters/cma_improvement_emitter.py	100.00% <100.00%> (ø)
qdax/core/emitters/cma_mega_emitter.py	98.63% <100.00%> (ø)
qdax/core/emitters/cma_opt_emitter.py	100.00% <100.00%> (ø)
qdax/core/emitters/cma_rnd_emitter.py	100.00% <100.00%> (ø)
... and 2 more

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