Implement `eth_decrypt` and `eth_getEncryptionPublicKey`. This allows decryption backed by the user's private key. The message decryption uses a confirmation flow similar to the messaging signing flow, where the message to be decrypted is also able to be decrypted inline for the user to read directly before confirming.
* tests - create tests for pending middlewares
* transactions - add r,s,v values to the txMeta to match the JSON rpc response
* network - add new middleware for eth_getTransactionByHash that the checks pending tx's for a response value
* transactions/pending - use getTransactionReceipt for checking if tx is in a block
* meta - file rename
