Benchmark v1.5.1.1000 vs v2.0.3.1000

[Liryna]

A benchmark that is testing multiple scenarios repeaditly and sequentially was run 5 times against the memfs sample of v1.5.1.1000 and v2.0.3.1000 in an idle environment to precise results.
The detail results can be seen in this spreadsheet here.
As better threading and memory poll were added in v2, it is expected that concurrent scenarios (like those tests) would be even more highly improved.

A sample of the results:

Create New      |  +13.55% | List          |  +60.69% | GetAttributes |  +48.78% | Read  | +18-42% |
Open/Overwrite  | +153.41% | ListExactFile | +131.91% | SetAttributes | +120.91% | Write | +10-32% |
RandomOpenClose | +173.05% |               |          | Delete        |  +90.83% |       |         |

ATTO is giving good results especially on real world buffer size (4k -> 128k).
1.5.1:

vs head:

[Liryna]

#1063