Add a benchmark command

[sophiajt]

Is your feature request related to a problem? Please describe.
It's sometimes helpful to want to measure how long a block takes to execute. It'd be nice to be able to measure this inside of Nu.

Describe the solution you'd like

Let's add a benchmark command that takes a block as input. When run, benchmark will start timing, run the block to completion, and then report the time it took to run the block.

The benchmark command can return the time as a Duration value.

Additional context
You can read the with-env command source code at "crates/nu-cli/src/commands/with_env.rs" to learn how to run a block to completion.

[pag4k]

I would like to work on this.

[sophiajt]

@pag4k great - I've assigned it to you

[quebin31]

Shouldn't be clearer and shorter to be bench instead of benchmark?

[thegedge]

Shouldn't be clearer and shorter to be bench instead of benchmark?

I think bench is less clear when considering an ESL (english as a second language) perspective, so I'd rather stick to full words and people can always alias to shorter names, if they so desire 🙂

Another option is time, which is pretty common in shells (and there's a /usr/bin/time on a lot of UNIX-y platforms).

[quebin31]

Shouldn't be clearer and shorter to be bench instead of benchmark?

I think bench is less clear when considering an ESL (english as a second language) perspective, so I'd rather stick to full words and people can always alias to shorter names, if they so desire slightly_smiling_face

Another option is time, which is pretty common in shells (and there's a /usr/bin/time on a lot of UNIX-y platforms).

Yea, I guess time would be even better, but it's clearly open to consensus.

[JosephTLyons]

Closed by #2223