Add benchmark command

[haroldrandom]

Add benchmark command to check every commands that could apear in Azure CLi and Azure CLI Extensions.

Run benchmark on the given commands, and display them generally. Run them with "python -m azure.cli {COMMAND}" in a seperately process.
It could run in live mode if you have logged in and the command could be executed properly in Shell.

Close Azure/azure-cli-extensions#64.

Changes will be on boarded to Azure/azure-cli Azure/azure-cli#14156

Test Guide:

Successful commands:

• azdev perf benchmark "version" "nework vnet" "group list"
• azdev perf benchmark "az storage account -h"

Non-existing commands:
It will run it as they are existing, and display it as normal. But the result is useless. like azdev perf benchmark qhjhwkehqkjhwe

[yonzhan]

benchmark command

[jiasli]

Nice work!! 🎉

Let's simply it to

azdev perf benchmark "az version"

Just like

az find "az vm create"

and choose the command to run in the CI later.

For --help command, we can explicitly include --help in the command, such as

azdev perf benchmark "az rest --help"

[haroldrandom]

@jiasli Refine as you suggest and update PR description.

There is one could be discussable - currently, I don't help to judge whether a given command is valid or not, I will run it anyway.

[jiasli]

I am actually think maybe we can use the dev version of azdev in the Azure CLI pipeline, instead of the one released on PyPI. This will make the development more agile.

[haroldrandom]

I am actually think maybe we can use the dev version of azdev in the Azure CLI pipeline, instead of the one released on PyPI. This will make the development more agile.

I will make it read on Azure/azure-cli ASAP