parseInt, parseFloat implementation

[Lan2u]

This Pull Request fixes/closes #447.

It changes the following:

• Adds an implementation of the builtin parseInt and parseFloat functions
• Associated tests

[codecov]

Codecov Report

Merging #459 into master will increase coverage by 0.14%.
The diff coverage is 85.31%.

@@            Coverage Diff             @@
##           master     #459      +/-   ##
==========================================
+ Coverage   66.24%   66.39%   +0.14%     
==========================================
  Files         131      146      +15     
  Lines        9039     9350     +311     
==========================================
+ Hits         5988     6208     +220     
- Misses       3051     3142      +91     

Impacted Files	Coverage Δ
boa/src/builtins/function/mod.rs	72.22% <ø> (ø)
boa/src/builtins/number/mod.rs	67.54% <51.16%> (-3.81%)	⬇️
boa/src/builtins/number/tests.rs	100.00% <100.00%> (ø)
boa/src/exec/iteration/mod.rs	74.07% <0.00%> (-14.17%)	⬇️
boa/src/syntax/ast/node/mod.rs	17.94% <0.00%> (-6.42%)	⬇️
boa/src/syntax/parser/statement/mod.rs	53.33% <0.00%> (-5.93%)	⬇️
...tax/parser/expression/assignment/arrow_function.rs	89.18% <0.00%> (-2.48%)	⬇️
.../syntax/parser/expression/left_hand_side/member.rs	65.71% <0.00%> (-1.94%)	⬇️
boa/src/syntax/ast/node/iteration.rs	40.74% <0.00%> (-1.76%)	⬇️
boa/src/syntax/parser/expression/primary/mod.rs	75.00% <0.00%> (-1.32%)	⬇️
... and 33 more

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[Razican]

It's looking very good, thanks :) check my comments and see if it can be improved.

[Razican]

Thanks for the changes :) I think there are a couple of issues with the implementation, check my comments.

[Razican]

Perfect, this is good to go for me :)