Add support for apache bench code gen

[liyingxiu]

Is your feature request related to a problem? Please describe.
Postman does not currently support apache bench code gen

Describe the solution you'd like
Add support for apache bench code gen. It would be very useful to have apache bench as one of the language options in the Generate Code Snippets pop up.

Additional context
https://paw.cloud/extensions/ApacheBenchmarkCodeGenerator
https://httpd.apache.org/docs/2.4/programs/ab.html

[gaoliang]

same here: postmanlabs/postman-app-support#1858

[gaoliang]

#221 pr here