Implement formatting for MappingProxyView.info

[ionite34]

Closes #31

[codecov]

Codecov Report

Merging #30 (bfb7117) into main (5b4fdde) will decrease coverage by 0.03%.
The diff coverage is 66.67%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #30      +/-   ##
==========================================
- Coverage   89.90%   89.86%   -0.03%     
==========================================
  Files          44       44              
  Lines        2137     2139       +2     
==========================================
+ Hits         1921     1922       +1     
- Misses        216      217       +1     

Flag	Coverage Δ
unittests	89.86% <66.67%> (-0.03%)	⬇️

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Impacted Files	Coverage Δ
src/einspect/views/view_mapping_proxy.py	90.63% <0.00%> (-0.28%)	⬇️
src/einspect/structs/mapping_proxy.py	94.45% <80.00%> (-5.55%)	⬇️

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