Improve Nonce management behaviour

[juans-chainsafe]

Expected behavior

There should be a easier way to get the nonce to be able to send transactions

Actual behavior

If you don't send the nonce, web3js will use the latest nonce instead of the "pending" causing, in some cases, to fail.

Steps to reproduce the behavior

1. Use this.provider.eth.sendTransaction(params[0])

Logs

• "Transaction receipt not found" error

Environment

4.11 web3js