[Feature] Add Transaction::to_input function

[mattsse]

Component

consensus, eips, genesis

Describe the feature you would like

currently input returns a slice even though we know the tx types internally always use Bytes, which makes it expensive to obtain a Bytes instance.

we should add

fn to_input(&self) -> Bytes

for this, this way cloning the input is cheap

cc @tcoratger

Additional context

No response

[DaniPopes]

#1487 ?

[mattsse]

makes sense although this wouldn't work for transactions (non-existing ones) that don't have input. but I guess we can make that assumption