feat(consensus-tx): enable fast is_create

[hai-rise]

Motivation

alloy-consensus::Transaction implementors didn't have a cheap way to check if the transaction was a Create. They had to go through kind which copies the 21-byte TxKind. This may scale poorly for code that processes (hundreds of) thousands of transactions per second: paradigmxyz/reth#12838.

Solution

Add is_create to the trait that allows fast non-allocating implementation. I considered making kind returns &TxKind but transactions like EIP-4844, 7702, etc. only store an Address and it would be bad if we forced them to promote it to TxKind.

PR Checklist

• Added Tests
• Added Documentation
• Breaking changes

[mattsse]

makes sense