Implement Function.prototype.apply

[georgeroman]

Fixes #872

[codecov]

Codecov Report

Merging #877 into master will increase coverage by 0.20%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #877      +/-   ##
==========================================
+ Coverage   59.08%   59.29%   +0.20%     
==========================================
  Files         164      165       +1     
  Lines       10209    10317     +108     
==========================================
+ Hits         6032     6117      +85     
- Misses       4177     4200      +23     

Impacted Files	Coverage Δ
boa/src/builtins/function/mod.rs	63.47% <66.66%> (+0.37%)	⬆️
boa/src/object/mod.rs	46.99% <0.00%> (-0.11%)	⬇️
boa/src/builtins/mod.rs	23.52% <0.00%> (ø)
boa/src/builtins/map/map_iterator.rs	71.42% <0.00%> (ø)
boa/src/builtins/iterable/mod.rs	94.23% <0.00%> (+0.35%)	⬆️
boa/src/builtins/array/mod.rs	73.51% <0.00%> (+0.80%)	⬆️
boa/src/builtins/map/mod.rs	72.26% <0.00%> (+0.95%)	⬆️
boa/src/builtins/map/ordered_map.rs	63.63% <0.00%> (+2.34%)	⬆️
...x/parser/statement/iteration/do_while_statement.rs	73.91% <0.00%> (+13.04%)	⬆️

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