Add dynamic mocking to proxy

[gregorgebhardt]

User Story Description

As a prism user, I designed my OpenAPI3 specification and added x-faker properties so that the data returned by prism is close to the real data. Now, I have started to work on the backend and want to switch from prism mock to prism proxy. However, for the mocked endpoints, I can't use dynamic mocking anymore because the proxy does not support it. I want to be able to switch to the prism proxy without changing the behavior of the mocked paths.

Acceptance Criteria

• [ ] added dynamic mocking for unimplemented paths.
• [ ] added cli option -d to enable dynamic mocking.

Sprint Ready Checklist

• [ ] Acceptance criteria defined
• [ ] Team understands acceptance criteria
• [ ] Team has defined solution / steps to satisfy acceptance criteria
• [ ] Acceptance criteria is verifiable / testable
• [ ] External / 3rd Party dependencies identified