Sequence Problems - S-MNIST, Addition

[RobertTLange]

Adds sequential MNIST and Addition problem:

evaluator = SequenceFitness(task_name="Addition", test=False)

evaluator = SequenceFitness(task_name="SMNIST", test=False)

[codecov-commenter]

Codecov Report

Merging #7 (972c094) into main (0629eb3) will decrease coverage by 0.93%. The diff coverage is 74.59%.

@@            Coverage Diff             @@
##             main       #7      +/-   ##
==========================================
- Coverage   91.51%   90.58%   -0.94%     
==========================================
  Files          46       47       +1     
  Lines        2110     2230     +120     
==========================================
+ Hits         1931     2020      +89     
- Misses        179      210      +31     

Impacted Files	Coverage Δ
evosax/problems/sequence.py	73.94% <73.94%> (ø)
evosax/problems/__init__.py	100.00% <100.00%> (ø)
evosax/problems/vision.py	60.00% <100.00%> (ø)