Version 4.17.0

[uerceg]

• Added getSdkVersion() method to Adjust interface to obtain current SDK version string.
• Added setCallbackId method on AdjustEvent object for users to set custom ID on event object which will later be reported in event success/failure callbacks.
• Added callbackId field to event tracking success callback object.
• Added callbackId field to event tracking failure callback object.
• Changed usage of compile keyword in plugin's build.gradle file into implementation.
• Updated Android SDK and build tools to 28.
• Marked setReadMobileEquipmentIdentity method of AdjustConfig object as deprecated.
• SDK will now fire attribution request each time upon session tracking finished in case it lacks attribution info.