NT-1867: eliminate unnecessary identify calls

[Arkariang]

📲 What

• Removed from TrackingClient.kt internal variables config and loggedInUser those two properties have become class properties on TrackingClientType.kt
• LakeTrackingClient.kt overrides it's own config and loggedInUser
• SegmentTrackingClient.kt overrides it's own config and loggedInUser
• For SegmentTrackingClient.kt we update the current user only when some of the traits has change with method updateUserAndCheckTraits
• Avoid race condition for initializing Segment SDK, call initialize only when we have configuration available
• Added isInitialized state for Segment SDK
• Modified several tests

👀 See

• No visible changes on this PR. It's all around behaviour.

📋 QA

• Make sure when you come from background identify it's not called
• Make sure if you change some of your Opt-in preferences identify it's called
• Make sure if you change your password or email you are logged out of the app and no identify is called
• Make sure every time you log in identify is called
• Race condition has been solved, all the events should get to Segment Dashboard

Story 📖

NT-1867

[hadia]

prefect👌👌