Implement Object#eql?

[st0012]

This closes #620

[codecov]

Codecov Report

Merging #843 into master will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #843      +/-   ##
==========================================
+ Coverage   81.11%   81.12%   +0.01%     
==========================================
  Files          54       54              
  Lines        7412     7418       +6     
==========================================
+ Hits         6012     6018       +6     
  Misses       1178     1178              
  Partials      222      222              

Impacted Files	Coverage Δ
vm/class.go	86.32% <100.00%> (+0.12%)	⬆️

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