feat: Simplify the usage of NeptuneLogger

[Higgcz]

Let NeptuneLogger initialize a new Neptune Run if the user doesn't specify it.

Waiting for #37

[codecov-commenter]

Codecov Report

Merging #38 (0258204) into master (eaac131) will decrease coverage by 0.00%.
The diff coverage is 28.57%.

❗ Current head 0258204 differs from pull request most recent head 5f01913. Consider uploading reports for the commit 5f01913 to get more accurate results

@@            Coverage Diff             @@
##           master      #38      +/-   ##
==========================================
- Coverage   52.18%   52.18%   -0.01%     
==========================================
  Files          43       43              
  Lines        6241     6245       +4     
==========================================
+ Hits         3257     3259       +2     
- Misses       2984     2986       +2     

Impacted Files	Coverage Δ
src/evotorch/logging.py	29.09% <28.57%> (+0.22%)	⬆️
src/evotorch/neuroevolution/net/vecrl.py	40.06% <0.00%> (ø)
src/evotorch/algorithms/distributed/gaussian.py	19.21% <0.00%> (ø)
src/evotorch/neuroevolution/net/statefulmodule.py	36.36% <0.00%> (+1.58%)	⬆️

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