[Feature Request] - Create benchmark for Array manipulation

[jasonwilliams]

In order to test the upcoming optimisation work we're doing around objects it would be good to have a benchmark for Arrays and manipulating them.

Example

Benchmarks live here
an array creation and access would be categorised under exec.

If exec benchmarks become too big we can compartmentalise them later on.

You can see the fibonacci benchmark here:
https://github.com/boa-dev/boa/blob/master/boa/benches/exec.rs#L49-L66

2 benchmarks could be made, 1 for accessing a value from an array, another for creating an array.
We could introduce more benchmarks here for various methods commonly used on arrays

in order to run the benchmarks you can run cargo bench in the root folder

Contributing

https://github.com/boa-dev/boa/blob/master/CONTRIBUTING.md
https://github.com/boa-dev/boa/blob/master/docs/debugging.md

[abhijeetbhagat]

I can take this up. Please assign it to me if no one else is working on it.