[SPIKE] Evaluate different methods for displaying token prices in freighter

[aditya1702]

Based on previous discussions, it looks like we have different options to consider from:

• Stellar Expert: Based on discussion that @aristidesstaffieri had with OrbitLens, they have an internal API that gives a best path for a token price pair. They agreed to open up this API for us. We need to follow up with them on more details around this API.
• Stellar Broker: https://stellar.broker/
• Horizon path finding to get the best paths for a pair - https://developers.stellar.org/docs/build/apps/example-application-tutorial/querying-data#findstrictreceivepaths