[feature] Support for Solana SPL Tokens in AppKit

[hugomoov]

What problem does this new feature solve?

Currently, the AppKit component correctly displays tokens on Ethereum networks but only shows SOL on Solana. This is an issue for dApps that use multichain tokens, as it prevents users from seeing their Solana-based assets properly.

Describe the solution you'd like

The AppKit component should support displaying SPL tokens on Solana, just like it does for ERC-20 tokens on Ethereum. This would ensure that multichain tokens appear correctly across both networks, improving consistency and user experience.

[linear[bot]]

APKT-2256 [feature] Solana tokens

[Sam-Newman]

Thanks for the feature request! We will try to work on this soon.