Antoine Stevan 3268ecd116
FEATURE: add the bench command to the standard library (#8969)
Should address the first point of
- https://github.com/nushell/nushell/issues/8696.

# Description
i've seen a few appearances of this `benchmark` idea in recent works on
`nu-std`, so i thought it would be great to add it finally.

# User-Facing Changes
a new `std bench` command to measure the performance of `nushell`
closures and code blocks.

# Tests + Formatting
- 🟢 `toolkit fmt`
- 🟢 `toolkit clippy`
-  `toolkit test`
- 🟢 `toolkit test stdlib`

# After Submitting
```
$nothing
```
2023-04-28 09:07:23 +02:00
..
2023-04-26 14:38:09 -05:00
2022-02-07 14:54:06 -05:00

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