[ENHANCEMENT] Parse robot file in multi process

[studytimesz]

Is your enhancement request related to a problem? Please describe. From output of robotcode extenstion, I saw a lot of process execution one by one for each suite in order, I am not sure, just an proposal, could robotcode execute this parse job in multi process? I mean, if there are a lot of suites/robot files, vscode need lots of time to parse and load these test cases into test tab.

Describe the solution you'd like parse robot/suite in multi process.