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Implement display_list (#738)

* Improve stringify of lists slightly

Used to have lots of annoying spaces at the end of a multiline list.
I've gotten rid of those spaces so the end of lists are simply suffixed
with ']'.

* Implement display_list and tests

* Change recursive visit() algorithm to iterative one (courtesy @openorclose)

* Add test that display_list runs in linear time

Works by measuring a bunch of size vs runtime points, and doing linear
regression on a log-log plot, using the resulting gradient as an
estimate for the power of the runtime complexity.

* Exclude slow display_list benchmark from CI test

* Check exact types in isArrayLike test

replPrefix and replSuffix should be strings,
replArrayContents should be a function.

* Remove snapshot of benchmark test

* Exclude benchmark test from github CI

2547 of 3347 branches covered (76.1%)

Branch coverage included in aggregate %.

6829 of 7900 relevant lines covered (86.44%)

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