[Meta Issue] Auto Asset Discovery

[yrliou]

This is a meta issue to track auto asset discovery feature development.

Core:

• Trigger asset discovery when restoring wallets or importing accounts. Auto detect token balances when > 0 balance #19746
• Expose API for UI to trigger asset discovery and fire OnAssetDiscoveryCompleted when it's done. Backend support for running DiscoverAssets on page refresh #25820
• Solana Asset discovery. Auto discovering Solana assets  #27246
• Added L2 support via using balance scanner contract for EVM chains. Use BalanceScanner contracts for ETH asset discovery #28203
• Fire OnAssetDiscoveryStarted/Completed events for both UI and core triggered asset discovery. Use onDiscoverAssetsCompleted callback when assets discovered in background process #27776
• NFT discovery support using SimpleHash #28651
• Support NFT discovery for ERC1155s #29304 (Blocked by frontend ERC1155 support)
• Support NFT discovery for ENS tokens #29121
• Add NFT discovery support for NonFungibleEdition and ProgrammableNonFungible Solana token types #29400

Desktop UI:

• Trigger asset discovery when loading portfolio page Frontend desktop support for running DiscoverAssets on page refresh #26547
• Handle OnAssetDiscoveryStarted/Completed events.

Android UI:

• Trigger asset discovery when loading portfolio page. Frontend Android support for running DiscoverAssets on page refresh #27344
• Handle OnAssetDiscoveryStarted/Completed event.

iOS UI:

• Trigger asset discovery when loading portfolio page. Frontend iOS support for running DiscoverAssets on page refresh brave-ios#6652
• Handle OnAssetDiscoveryStarted/Completed events.