Set __proto__ of function instances

[54k1]

This Pull Request fixes/closes #531

It changes the following:

• make_builtin_fn now takes &Interpreter as an argument.
• Call sites are updated according to the new function signature of make_builtin_fn

[codecov]

Codecov Report

Merging #604 into master will increase coverage by 0.84%.
The diff coverage is 83.25%.

@@            Coverage Diff             @@
##           master     #604      +/-   ##
==========================================
+ Coverage   71.67%   72.51%   +0.84%     
==========================================
  Files         177      179       +2     
  Lines       11647    12553     +906     
==========================================
+ Hits         8348     9103     +755     
- Misses       3299     3450     +151     

Impacted Files	Coverage Δ
boa/src/builtins/mod.rs	22.58% <0.00%> (-0.76%)	⬇️
boa/src/builtins/object/mod.rs	38.81% <0.00%> (-0.36%)	⬇️
boa/src/builtins/value/val_type.rs	24.00% <0.00%> (-1.00%)	⬇️
boa/src/builtins/value/mod.rs	65.49% <50.00%> (-0.44%)	⬇️
boa/src/builtins/date/mod.rs	69.75% <69.75%> (ø)
boa/src/builtins/value/operations.rs	31.36% <80.00%> (+0.48%)	⬆️
boa/src/builtins/date/tests.rs	99.30% <99.30%> (ø)
boa/src/builtins/object/tests.rs	100.00% <100.00%> (ø)
boa/src/realm.rs	72.22% <100.00%> (+1.63%)	⬆️
... and 2 more

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[HalidOdat]

Looks good! check my comment :)

[HalidOdat]

Looks perfect to me! :)

[Razican]

Looks good, check my comment, for my understanding.