Implement Object.getOwnPropertyDescriptor() and Object.getOwnPropertyDescriptors()

[JohnDoneth]

It changes the following:

• Implements Object.getOwnPropertyDescriptor( object, property ) and Object.getOwnPropertyDescriptors( object )

[codecov]

Codecov Report

Merging #798 into master will decrease coverage by 0.07%.
The diff coverage is 73.17%.

@@            Coverage Diff             @@
##           master     #798      +/-   ##
==========================================
- Coverage   59.37%   59.29%   -0.08%     
==========================================
  Files         157      157              
  Lines       10036    10078      +42     
==========================================
+ Hits         5959     5976      +17     
- Misses       4077     4102      +25     

Impacted Files	Coverage Δ
boa/src/builtins/object/mod.rs	64.86% <73.17%> (+3.18%)	⬆️
boa/src/context.rs	61.08% <0.00%> (-6.04%)	⬇️
boa/src/syntax/parser/expression/update.rs	70.96% <0.00%> (-1.76%)	⬇️
boa/src/profiler.rs	0.00% <0.00%> (ø)
boa/src/syntax/ast/node/array/mod.rs	74.07% <0.00%> (+0.16%)	⬆️

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[HalidOdat]

Hey @JohnDoneth, there is a conflict could you rebase this PR.

[Razican]

Looks good! Check my comments about the documentation, I think it's best if we use the rolling spec, and we need to fix a link at least.

[Razican]

Looks good to me!