Need a way to programatically stop stub server

[sahilaug]

Is your feature request related to a problem? Please describe.
There is no stop method to stop the stub server programmatically

Describe the solution you'd like
We should add a stopStubServer method to the testHelperLibrary, which can be called by any of the JS test frameworks like Jest, Cypress etc

Describe alternatives you've considered
n/a

Additional context
This will be a companion method to other methods in the test lib like startStubServer