perf: add query params to run benchmarks for repeat

[prudepixie]

Following the work for adding appending related benchmarks, we want to use a similar model to create benchmarks for 'repeat' from fast-element.

The pattern is to run different benchmark implementations of the same file using query-params.
?method=repeat
?method=forEach
?method=map

Perhaps a --url argument can be added to the cli in this case.
Currently the append benchmarks are run by a custom script.