Synchronize OpenRPC specification

[aoudiamoncef]

The current state of OpenRPC specification does't match latest input/output. We have to check every method parameters and results.

• [ ] get_addresses
• [ ] get_block
• [ ] get_blockclique_block_by_slot
• [ ] get_cliques
• [x] get_datastore_entries
• [ ] get_endorsements
• [ ] get_filtered_sc_output_event
• [ ] get_graph_interval
• [x] get_operations
• [x] get_stakers
• [ ] get_status
• [x] add_staking_secret_keys
• [x] node_ban_by_id
• [x] node_ban_by_ip
• [x] get_staking_addresses
• [x] node_remove_from_whitelist
• [x] remove_staking_addresses
• [x] node_sign_message
• [x] stop_node
• [x] node_unban_by_id
• [x] node_unban_by_ip
• [x] node_whitelist
• [x] send_operations
• [ ] execute_read_only_call
• [ ] execute_read_only_bytecode