Add object get property names

[GustavoCaso]

Related to https://github.com/rogchap/v8go/issues/213

I'm trying to give a try to my first PR that adds new logic both in Go and in C++.

I'm not 100% sure that want I'm doing is the right thing to do and I would love some guidance if possible. @dylanahsmith @rogchap

Basically, I'm trying to return an array with all the property names from V8 using the obj->GetPropertyNames(local_ctx).

Is there anything that I'm missing?

Thanks 😄

[codecov[bot]]

Codecov Report

Merging #260 (fab0a50) into master (5e91d3d) will decrease coverage by 0.25%. The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master     #260      +/-   ##
==========================================
- Coverage   95.86%   95.60%   -0.26%     
==========================================
  Files          17       17              
  Lines         580      592      +12     
==========================================
+ Hits          556      566      +10     
- Misses         15       16       +1     
- Partials        9       10       +1     

Impacted Files	Coverage Δ
context.go	97.14% <80.00%> (-2.86%)	:arrow_down:
object.go	100.00% <100.00%> (ø)

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