Removal of Non-Minimum JSON-RPC Signing Methods and Wallet Functionality

Request to remove usage of `eth_sign`, `eth_sendTransaction`, and `eth_signTransaction`. As well as methods like `eth_accounts` in the repository as they represent wallet functionality that is not necessary for the goal of representing the minimum JSON-RPC for an Ethereum node. Instead, the usage of `eth_sendRawTransaction` should be considered as the minimum interface for sending transactions on the Ethereum network and should be in line with the repository's goal of representing the minimal JSON-RPC interface for an Ethereum node without the need for wallet functionality.