Add query parameter and input json body support to API Mock Server

[lokal-admin]

As listed in the github issue here - #9075
When we use query params in Mock server APIs, they are ignored and the same response is sent back.
We need support to treat the "whole URL" as the unique key and to define different responses for them.

This should be extended to POST requests with "incoming data" too. The data should also be considered in managing what response will go out. So the "URL+incoming data" should be treated as unique key instead of just the URL.