[Feature request] Add support of systrace traces for instance creations

[PatilShreyas]

It would be nice to have a configurable option to enable system traces for Dagger Android module which will have traces for instance creation to debug performance with DI.

Advantages can be:

• Can debug the need of making instance @Singleton or not if we see lot of allocations of it (this is anyway possible with memory profiler as well but systrace can give better picture here)
• Based on these insights, one can decide to use Lazy<> or Provider<> better as per use case needs.
• Easy performance debugging w.r.t DI

Example:

In this case, LightDependency is a class which is very lightweight to create whereas HeavyDependency might be doing heavy operations while instance creation (it may be 3rd party library instance as well to which we can't add traces as of now)

class LightDependency @Inject constructor(...) {}

class HeavyDependency @Inject constructor(...) {}

class MyClass(private val dependency1: LightDependency, private val dependency2: HeavyDependency) {
  // ...
}

Then systrace can give picture like this: