Implement encoding and signing for EIP-4844 transaction requests

[Rjected]

Is your feature request related to a problem? Please describe.
Currently it is not possible to implement something like cast send --blob, because ethers-rs does not support signing and RLP encoding an EIP4844 transaction request.

Describe the solution you'd like
A new typed transaction request type should be implemented which has correct RLP encoding. This should be feature gated behind a new feature flag kzg, since c-kzg will need to be pulled in as a dependency.

This should support encoding for:

• signing, and
• eth_sendRawTransaction encoding

Additional context
An existing implementation of this can be found here:
https://github.com/paradigmxyz/reth/blob/34004938415a449c773530d5fb3ff3a99b099ace/crates/primitives/src/transaction/eip4844.rs#L315-L321

https://github.com/paradigmxyz/reth/blob/34004938415a449c773530d5fb3ff3a99b099ace/crates/primitives/src/transaction/eip4844.rs#L295-L306

https://github.com/paradigmxyz/reth/blob/34004938415a449c773530d5fb3ff3a99b099ace/crates/primitives/src/transaction/sidecar.rs#L101-L127

[yjhmelody]

I think also need to support the codec for block new fields