Feature/add websocket functionallity

[trinatafoya]

Description

This pull request is a feature that allows the har-to-k6 converter to handle web-socket functionality. It uses the k6 library import ws from 'k6/ws'. These requests were formerly ignored in the original itteration of har-to-k6.

Type of change

• This version handles the websocket send(...) messages and adds a setTimeout in place of sleep for websockets, this is because k6 websocket callbacks are not made to work with the sleep(...) function.
• Websocket send messages are the only messages that are handled here
• Once the file is converted, if you have specific timings or order that needs to be handled you must add that yourself.
• This is very generic to support many different kinds of websocket testing

[CLAassistant]

All committers have signed the CLA.

[EdvinasDaugirdas]

Hey @trinatafoya, thank you for your PR submission!

Unfortunately, I can not approve your PR, mainly due to the reason that we're currently overhauling k6 WebSockets APIs. You can find the new experimental module here: https://k6.io/docs/javascript-api/k6-experimental/websockets/.

As the name implies, the module is still experimental and is not fully implemented. Only when the k6 WS APIs become stable and land in k6 we'll be considering adding support to har-to-k6.