feature: set nonce in fill transaction

[prestwich]

Motivation

Set nonces properly when filling transactions. Previously, nonces have been set by the node or the nonce manager during send_transaction calls. I erroneously assumed that fill_transaction would set the nonce. As a result, send_escalating never properly sets the nonce. This PR adds two additional places a nonce may be filled

Previously, I wanted to add a nonce filler to fill_transaction however, this would always override the node's suggested nonce when using an RPC signer via send_transaction. Instead, I chose to add it to send_escalating

Solution

• add a nonce check to send_escalating
• ensure NonceManagerMiddleware fills the nonce from its manager

PR Checklist

• Added Tests
• Added Documentation
• Updated the changelog