fix(breaking): use real timers internally to fix awaiting with fake timers (#568)

* capture global timers, use them in waitFor, tests+

* use real timers in flushMicroTasks

* test to show changes with modern timer mocks

* use enum-like object for timer modes

* fix tests

* remove default timer mode, add flow types
export other timer helpers, adjust tests and docs

* base waitFor on RTL implementation

* [jest] Capture and restore global promise

* [waitFor] Simulate intervals when using fake timers

* [tests] Fix waitForElementToBeRemoved

* cleanups; use more specific global

* rename globals to match others

Co-authored-by: Michael James Duminy <michael-james.duminy@klarna.com>
Co-authored-by: Michał Pierzchała <thymikee@gmail.com>

package.json

@@ -70,11 +70,12 @@
     "build": "rm -rf build; babel src --out-dir build --ignore 'src/__tests__/*'"
   },
   "jest": {
-    "preset": "react-native",
+    "preset": "../jest/preset.js",
     "moduleFileExtensions": [
       "js",
       "json"
     ],
-    "rootDir": "./src"
+    "rootDir": "./src",
+    "testPathIgnorePatterns": ["timerUtils"]
   }
 }