Remove tuples from JSON RPC responses (#7806)

* Remove RpcConfirmedBlock tuple

* Remove getRecentBlockhash tuple

* Remove getProgramAccounts tuple

* Remove tuple from get_signature_confirmation_status

* Collect Rpc response types

* Camel-case epoch schedule for rpc response

* Remove getBlockCommitment tuple

* Remove getStorageTurn tuple

* Update json-rpc docs

sdk/src/account.rs

@@ -5,6 +5,7 @@ use std::{cmp, fmt, iter::FromIterator};
 /// An Account with data that is stored on chain
 #[repr(C)]
 #[derive(Serialize, Deserialize, Clone, Default)]
+#[serde(rename_all = "camelCase")]
 pub struct Account {
     /// lamports in the account
     pub lamports: u64,