[Debt] Improve consistency of best practice application - #32

Closes #30

Apologies for the large file diff, it was unavoidable.

Largely cosmetic changes aimed at increasing consistency across examples.
This helps create a basic style guide to roughly follow for outside contributors.

• Adds clippy lint rules in workspace root, use the same configuration as Reth. In addition warn on uninlined_format_args
• Use consistent way of setting up example environment (anvil, provider) where applicable
• Use ? instead of .unwrap() across all examples
• url -> rpc_url
• Refer to tx_request as tx, pending as pending_tx
• Refer to transaction sending as sending, not broadcast
• Consistently group code blocks with explaining comment - treat each example as if it is to be understood on its own. Each example should have more detailed comments at the code block it focuses on, less on the setup.
• In most cases, refer to signer instead of wallet
• Use Alice and Bob if referring to a from and to pair, if singular from prefer unnamed
• End comments with a .

Should contain no breaking changes and fundamental changes in behaviour.