OR-5285 Timers:: RunLoop

[crazymanish]

Context

• Close ticket: [w33(13august-19august)] Timers: Using RunLoop #48

In this PR

• Timers using RunLoop
• Before the Dispatch framework was available, developers relied on RunLoop to asynchronously perform tasks and implement concurrency.
• Timer (NSTimer in Objective-C) could be used to create repeating and non-repeating timers.
• Then Dispatch arrived and with it, DispatchSourceTimer.

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• Using RunLoop
• The main thread and any thread you create, preferably using the Thread class, can have its own RunLoop.
• It is always better, to use the main RunLoop that runs the main thread of your application. RunLoop.main
• RunLoop class is not thread-safe. means You should only call RunLoop methods for the run loop of the current thread.
• RunLoop defines several methods which are relatively low-level, and the only one benefit that lets you create cancellable timers