Add warning and failing test decorators

[Latropos]

Summary

After this PR we are going to support the following API:

Describe:

• describe("Name of the test suite", ()=>{})
• describe.skip("Name of the test suite", ()=>{})
  • Skip test suite
• describe.only("Name of the test suite", ()=>{})
  • Run only test cases and test suite(s) with only decorator

Test:

• default
  • test("Name of the test suite", ()=>{})
  • test.each([1,2,3])("Name of the test suite", ()=>{})
• skip ⏭️ - skip test case(s)
  • test.skip("Name of the test suite", ()=>{})
  • test.skip.each([1,2,3])("Name of the test suite", ()=>{})
• only - run only test case(s) and suite(s) with only decorator
  • test.only("Name of the test suite", ()=>{})
  • test.only.each([1,2,3])("Name of the test suite", ()=>{})
• warn ⚠️ - expect console.warn to be called
  • test.warn("Name of the test suite", "Expected error message", ()=>{})
  • test.warn.each([1,2,3])("Name of the test suite", "Expected error message", ()=>{})
• failing - expect error to be thrown
  • test.failing("Name of the test suite", "Expected error message", ()=>{})
  • test.failing.each([1,2,3])("Name of the test suite", "Expected error message", ()=>{})

Test plan

[szydlovsky]

Looks good, left just one small comment 😄