Add Cardano Native Asset Support

[justinschreiner]

• Get all assets in wallet
• Lookup asset metadata in registry
• Show asset metadata in UI

[jinglescode]

need to cache all asset metadata in user's local storage or indexeddb, and add a last updated timestamp.
so assets metadata dont have to be query again and again each time user loads.
this is needed for performance and reduce api calls.

able to send native tokens in transaction.
show assets in transactions if received or sent transactions.