Add Sui Dappkit WalletConnect support: sui_getAccounts and JSON tx

[0xh3rman]

• Implement sui_getAccounts and serialize the account public key into sessionProperties at approval so Sui Dappkit dapps can connect
• Resolve TS SDK Transaction.toJSON() payloads (unresolved objects, FundsWithdrawal inputs, missing gas) into signed-ready BCS for preload, signing, and balance-change simulation
• Surface trailers-only gRPC errors with decoded grpc-message
• Document account public keys in the keystore docs

Cetus swap