Add Solana balance querying to `getBalances`

[fadeev]

• Devnet and mainnet support
• Update the hardhat balances task as well
• Make sure the function handles a case when Solana key is not available (skip balance querying)
• Ensure getBalances still works in browser (Balances component in UniversalKit should show SOL balance)
• Ensure that address derived in the toolkit matches the one in the official Solana extension wallet for the same key/mnemonic.
• Add tests

[lukema95]

I would like to try it.

[fadeev]

If you think any changes to how ZetaChainClient is initialized need to be made, do comment! We can create a separate issue for that.

[lukema95]

If you think any changes to how ZetaChainClient is initialized need to be made, do comment! We can create a separate issue for that.

Do we need to add a component to universalkit that connects to the Solana wallet?

[fadeev]

@lukema95 as part of a separate contribution, yes!

https://github.com/zeta-chain/universalkit/issues/22

[fadeev]

Seems like Solana can be added to RainbowKit:

https://docs.phantom.app/library-integrations/rainbowkit

[lukema95]

Seems like Solana can be added to RainbowKit:

https://docs.phantom.app/library-integrations/rainbowkit

The Phantom wallet also supports EVM, so here RainbowKit only supports Phantom's EVM network, not Solana's. solana currently uses a lot of wallets like Backpack, and should have a tool to connect more Solana wallets.

[lukema95]

As the number of supported heterogeneous chains increases, perhaps we should build a tool to manage all wallets.

[fadeev]

Ok, for now getBalances should just probably just take a Solana address optionally like EVM and Bitcoin.