Add spec for ExceptionsManager (#24900)

Summary:
Part of #24875, adds a spec for ExceptionsManager

## Changelog

[General] [Added] - TM Add spec for ExceptionsManager
Pull Request resolved: https://github.com/facebook/react-native/pull/24900

Reviewed By: fkgozali

Differential Revision: D15434006

Pulled By: RSNara

fbshipit-source-id: 1a505744a84c0c4ac3a9fac6c91a391fbd8a9f46

Libraries/Core/Devtools/parseErrorStack.js

@@ -10,12 +10,7 @@
 
 'use strict';
 
-export type StackFrame = {
-  column: ?number,
-  file: string,
-  lineNumber: number,
-  methodName: string,
-};
+import type {StackFrame} from '../NativeExceptionsManager';
 
 export type ExtendedError = Error & {
   framesToPop?: number,