Implement optimization for Android with R8

[whyoleg]

Fixes #1

Tested with Android Studio on emulators with API 35 (Android 15) and API 23 (Android 6.0) with the following config:

debug {
    isDebuggable = false
    isMinifyEnabled = true
    proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"))
}

At my side with call to ServiceLoader.load<TestService> in MainActivity just after super.onCreate(savedInstanceState) with three implementations takes around:

• 10-20 millis with isMinifyEnabled=false on 0.1.0
• 10-20 millis with isMinifyEnabled=true on 0.1.0
• 10-20 millis with isMinifyEnabled=false on this PR
• 300-500 nanoseconds with isMinifyEnabled=true on this PR

I get the same 300-500 nanoseconds with isMinifyEnabled=true if I will just repeat the same machinery in the app, as I use under the hood to aggregate services, when just passing objects.
I get 100-200 nanoseconds with isMinifyEnabled=true if to remove the machinery and just use java.util.ServiceLoader.load.

Yeah, there is some overhead, but I would say it's rather minimal. Of course the situation on real devices will be different, but it will be different even with manual initialization.

So, looks like in the end currently ServiceLoader on Android is not really slow. Except for the case when the Service is in base module, but ServiceProvider is in the feature module.