JUG-11 Add custom response definition

[datalek]

List of Changes

• Replace MockRequest and MockOutput with HttpRequest and HttpResponse
• Add CustomResponseDefinition

Motivation and Context

The system shall allow the user to define customized responses for a given request. This PR adds the code that manages the fallback between the user-defined response and the mock's random response.

How Has This Been Tested?

Unit test.

Types of changes

• Chore (nothing changes by a user perspective)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 7a4b77e

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