Fix the interface of `make_I`

[engintoklu]

The function evotorch.tools.make_I was accepting a single integer as the size indicator of the identity matrix. However, the method Problem.make_I was working only when the size was given as a single-element tuple. This pull request makes their interfaces compatible by making isure that both will work with a single integer or with a size tuple containing a single integer. Tests are updated to verify the correctness of the revised interfaces.

[flukeskywalker]

👍🏽

[codecov-commenter]

Codecov Report

Merging #62 (5c7d266) into master (aa57024) will increase coverage by 0.11%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #62      +/-   ##
==========================================
+ Coverage   77.74%   77.86%   +0.11%     
==========================================
  Files          49       49              
  Lines        7321     7329       +8     
==========================================
+ Hits         5692     5707      +15     
+ Misses       1629     1622       -7     

Impacted Files	Coverage Δ
src/evotorch/algorithms/cmaes.py	82.94% <100.00%> (ø)
src/evotorch/distributions.py	81.16% <100.00%> (-0.07%)	:arrow_down:
src/evotorch/tools/misc.py	86.42% <100.00%> (+0.06%)	:arrow_up:
src/evotorch/tools/tensormaker.py	94.59% <100.00%> (+6.02%)	:arrow_up:
src/evotorch/core.py	74.55% <0.00%> (+0.07%)	:arrow_up:

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