refactor(benchmark): simplify writing benchmarks

Adds `benchmarks/benchpress` module and adjusts the compiler
benchmarks to use it. Also adds the Angular 1.3 benchmark
to the compiler benchmarks
As far as I know benchpress does not support Dart. So maybe we should not move this file there. I think we should move only the ES6 version to benchpress, and then create some Dart wrappers here.