Provide ability to add custom arguments in command

### Runtime

node.js

### Runtime version

v22.11.0

### Module version

25.1.3

### Used with

Unit test for api

### Any other relevant information

It would be amazing if we could add our custom flag or argument to the command for running test.

I have a case where I would like to optionally generate file along my unit test.

### What problem are you trying to solve?

Currently it prevents me to add custom flags

`lab -S -l -m 20000 -M 20000 --generate-pdf`

this will not let me run the command.

### Do you have a new or modified API suggestion to solve the problem?

_No response_