Add benchmarks

[zrzka]

trafficstars

Still unclear if we will use anes-rs parser or when, but it's not important now, because the parser isn't finished (still WIP).

I made some changes in the zrzka/performance branch based on the manual profiling of the code with Instruments, because of the https://github.com/gyscos/cursive/pull/406 PR.

But we should provide benchmarks (especially for events parsing), so we can check that there's no regression after every change we make in the event module. crossterm is used as a backend for the cursive crate with 36 dependent crates and any regression can influence all of them. Not talking about projects (applications) that are not published to crates.io (not listed in the dependent crates).

[TimonPost]

Yes, we will be using that. Once it is ready we can do an 0.14.* release.