Allow getting validation-enabled mock URLs

[lbroudoux]

Reason/Context

In Microcks 1.11.0, we introduced mick endpoints that are doing client request validation before returning the mock response (see https://microcks.io/blog/microcks-1.11.0-release/#validation-on-mocks).

Description

We should provide new methods to get those endpoints instead of the existing ones if the user wants to turn-on validation for its requests.

Implementation ideas

New methods like getValidatingRestMockEndpoint() should be provided.

[lbroudoux]

Now implemented