feat(consensus): add extra EIP-4844 types needed

[Evalir]

Motivation

We still need to add a few EIP-4844 types to be able to properly send and decode full EIP-4844 txs with a sidecar. Right now we can't do that, and the TxEip4844 contained in the envelope is incomplete, as it misses the sidecar.

Solution

Add the needed types. Closes #231

PR Checklist

• Added Tests
• Added Documentation
• Breaking changes

[mattsse]

the enum approach is the most straight forward one imo.

though we still want an actual type for the 4844+blob variant

[mattsse]

the cfg on the type itself is not pretty.

I think we should try to limit kzg feature to validation.
we should be able to use primitive types for the blob fields instead and not kzg types here

[mattsse]

last nits

now that we're limiting c-kzg to validation, we can make this no default :)

[mattsse]

lgtm,

though maybe we can find a better name than Wrapper, maybe Variant?

pending @DaniPopes

[mattsse]

@Evalir let's rename to Variant then send it

[Evalir]

clippy failure unrelated.