Update benchmarks

[Gigas002]

In order to improve benchmarks results, I'd like to add Gdal2Tiles.exe with multiprocessing ability. I'm very new to Python/PyInstaller, so I couldn't do it by myself (my converted .exe file throws errors, when I try to run it with --processes argument).
So, if you can do this, please, convert gdal2tiles.py to .exe with ability to run in multiprocessing mode and link the binaries for windows here.
And it would be even better, if you'll write how to do this, so I'll be able to always use the latest version of Gdal2Tiles in benchmarks.

P.S.
I tried to add this to gdal2tiles.py (StackOverflow discussion of similar question):

if __name__ == '__main__':
    multiprocessing.freeze_support()

But still, that didn't help.

[Gigas002]

• Probably can use docker images of gdal and MapTiler
• Use newest MapTiler
• Use benchmarksdotnet

[Gigas002]

Depends on all issues for Milestone 2.0.0 from Core and Tests projects.

After they're complete, it's safe to update the benchmarks app.

Steps before releasing:

• Use latest gdal2tiles.py (try docker)
• Use latest maptiler (if possible, probably can use docker image)
• Use benchmarkdotnet for more precise results