chore: solana_signBatchTransactions

[malicegummy]

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[FEDSimp]

I propose renaming it to solana_signAllTransactions to put it in line with Solana wallet adapters. Wallet adapters are the main way solana dApps sign transactions so it makes sense to make RPC suitable for them. See https://github.com/WalletConnect/walletconnect-docs/issues/173

[FEDSimp]

@pedrouid Close this too in favor of #174?

[pedrouid]

Closing stale PR