REST API to get information about Runs, Suites, Test Scenarios, etc

[tatyana-nikolaeva]

We need new REST API to get information about all entities (Runs, Suites, Test Scenarios, etc.). So, providing parent entity id, we should get the children entities. For example, get all Suites of a specified Run. Or get all Testcases of a specified Suite. Support of pagination is a nice to have.