Add value.SameValue(otherValue) function

[dylanahsmith]

When comparing objects, it would be useful to be able to test that the objects are the same and don't just have the same data, so I exposed v8::Value::SameValue

[codecov]

Codecov Report

Merging #162 (69ec10f) into master (9ec924d) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 69ec10f differs from pull request most recent head 4f1b761. Consider uploading reports for the commit 4f1b761 to get more accurate results

@@           Coverage Diff           @@
##           master     #162   +/-   ##
=======================================
  Coverage   96.93%   96.94%           
=======================================
  Files          12       12           
  Lines         457      458    +1     
=======================================
+ Hits          443      444    +1     
  Misses          9        9           
  Partials        5        5           

Impacted Files	Coverage Δ
function_template.go	100.00% <100.00%> (ø)
value.go	97.54% <100.00%> (+0.01%)	⬆️

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[rogchap]

Looks all good.