Add Object.defineProperties and handle props argument in Object.create

[dvtkrlbs]

This Pull Request fixes/closes #552.

It changes the following:

• It adds define_properties to both internal and external Object struct

[dvtkrlbs]

I am looking for feedback on this. I might have missed some stuff since spec is kinda confusing

[codecov]

Codecov Report

Merging #746 into master will increase coverage by 0.49%.
The diff coverage is 82.35%.

@@            Coverage Diff             @@
##           master     #746      +/-   ##
==========================================
+ Coverage   59.15%   59.64%   +0.49%     
==========================================
  Files         155      155              
  Lines        9841     9970     +129     
==========================================
+ Hits         5821     5947     +126     
- Misses       4020     4023       +3     

Impacted Files	Coverage Δ
boa/src/builtins/object/mod.rs	59.81% <68.42%> (+0.86%)	⬆️
boa/src/object/internal_methods.rs	55.34% <100.00%> (+4.65%)	⬆️
boa/src/syntax/lexer/identifier.rs	62.50% <0.00%> (-22.12%)	⬇️
boa/src/syntax/parser/function/mod.rs	67.69% <0.00%> (-3.74%)	⬇️
boa/src/syntax/parser/statement/mod.rs	54.08% <0.00%> (-2.35%)	⬇️
boa/src/value/mod.rs	71.57% <0.00%> (-0.72%)	⬇️
boa/src/syntax/parser/statement/switch/mod.rs	69.09% <0.00%> (ø)
boa/src/context.rs	70.67% <0.00%> (+0.53%)	⬆️
boa/src/syntax/lexer/number.rs	64.22% <0.00%> (+0.81%)	⬆️
boa/src/syntax/parser/cursor/buffered_lexer/mod.rs	85.91% <0.00%> (+0.84%)	⬆️
... and 15 more

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[dvtkrlbs]

Ok i think this is ready for review now. I know that i did not add any tests but i have no idea on how to test this. So i could use some help there

[RageKnify]

@dvtkrlbs for a test you can look at https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperties for an idea of how to test it.
I'd say to write the test in boa/src/builtins/object/tests.rs.

[RageKnify]

Adding 1 test should be enough to improve the coverage values.