Add newTarget to construct

[tofpie]

This Pull Request fixes #1009.

It changes the following:

• Change the construct method to handle new_target,
• Change all the built-in constructors to handle new_target
• Change String constructor to make it more compliant

[Razican]

Test262 conformance changes:

Test result	master count	PR count	difference
Total	78,497	78,497	0
Passed	24,550	24,596	+46
Ignored	15,585	15,585	0
Failed	38,362	38,316	-46
Panics	24	24	0
Conformance	31.28	31.33	+0.06%

[codecov]

Codecov Report

Merging #1045 (265408f) into master (abd893c) will increase coverage by 0.22%.
The diff coverage is 82.12%.

@@            Coverage Diff             @@
##           master    #1045      +/-   ##
==========================================
+ Coverage   58.37%   58.59%   +0.22%     
==========================================
  Files         173      173              
  Lines       12050    12214     +164     
==========================================
+ Hits         7034     7157     +123     
- Misses       5016     5057      +41     

Impacted Files	Coverage Δ
boa/src/builtins/function/mod.rs	69.64% <0.00%> (-6.09%)	⬇️
boa/src/environment/lexical_environment.rs	67.30% <ø> (-0.32%)	⬇️
boa/src/builtins/symbol/mod.rs	76.86% <66.66%> (-0.41%)	⬇️
boa/src/builtins/string/mod.rs	62.98% <80.00%> (+0.36%)	⬆️
boa/src/builtins/error/eval.rs	70.00% <83.33%> (+5.00%)	⬆️
boa/src/builtins/error/mod.rs	69.38% <83.33%> (+2.72%)	⬆️
boa/src/builtins/error/range.rs	70.00% <83.33%> (+5.00%)	⬆️
boa/src/builtins/error/reference.rs	70.00% <83.33%> (+5.00%)	⬆️
boa/src/builtins/error/syntax.rs	70.00% <83.33%> (+5.00%)	⬆️
boa/src/builtins/error/type.rs	70.00% <83.33%> (+5.00%)	⬆️
... and 11 more

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[Razican]

This is looking very good. I had some comments, though. Let me know if you think they make sense :)

[RageKnify]

Noted some minor changes to improve readability, and minor bugs.

I'm not sure using the first argument for new_targetwhen normally it would be for this is correct (I'd like to get @HalidOdat's opinion on this). There's FunctionEnvironmentRecord.new_target, but that's not really used...

[RageKnify]

Code looks good, still unsure about having newTargetbe the first argument of constructors.

[Razican]

I'm ok having newTarget as first argument for now, that can be changed later if we need to or find a better solution. I'm happy to merge this :)

[HalidOdat]

Looks good to me! :)