Mocks for networking monitor

[loucimj-latch]

Is your feature request related to a problem? Please describe. I'm a Proxyman user, and the only thing I miss in the networking monitor is the possibility to mock a response with a custom response or error

Describe the solution you'd like Mock a request with a json file or an error

Describe alternatives you've considered Proxyman

[AvdLee]

For now, this is not on the roadmap short term. However, totally get that this would be useful, so I'll keep this issue open for the future.