Properly segregate sample scenes by packages

[kantagara]

Currently, our sample scenes are kind of intertwined. For example, SampleLogin requires you to import Web3Auth package otherwise it won't work. Our lootbox scene can work OOB so that one is okay.
TODOs

• Make a separate scene for SampleLogin without web3auth that's bundled with our web3sdk sample and that is using only wallet connect. Since WC t is present in our core solution. So we'd need two scenes. SampleLoginWalletConnect and SampleSceneWeb3AuthAndWalletConnect (this one should go inside the web3auth sample package).
• SampleMain should stay in the core package sample because it can work with both WC and Web3Auth IIRC
• Both Lootboxes and Web3Auth samples should be part of the UnitySampleProject
• SampleInitializer.cs needs to add any scenes that need to be added in EditorBuildSettings
• Adding additional job that would import samples from web3auth and lootboxes via CI.