[Feature] Define Signature trait

[emhane]

Component

primitives

Describe the feature you would like

Add methods in Signature impl into new trait, and impl new trait for Signature. Add as super traits any From<T> etc impls for Signature.

Additional context

No response

[grandima]

Hi @emhane
I see this issue marked as "good first issue". I'd like to get to know with the the project and implement it. Can you assign this to me?

[emhane]

we probably also want something like

#[cfg(not(feature = "rlp"))]
trait SignatureSuperTrait {}

#[cfg(feature = "rlp")]
trait SignatureSuperTrait: alloy_rlp::Encodable + alloy_rlp::Decodable {}

pub trait Signature: .. + SignatureSuperTrait {
    ...
}

but can do this as separate issue too