Builder flow for Deneb & Blobs (#4428)

* Add Deneb builder flow types with generics

* Update validator client `get_blinded_blocks` call to support Deneb

* `produceBlindedBlock` endpoint updates:
- Handle new Deneb BuilderBid response from builder endpoint (new BlindedBlobsBundle type)
- Build BlockContents response (containing kzg_commitments, proof and blinded_blob_sidecars)

* Appease Clippy lint

* Partial implementation of submit blinded block & blobs. Refactor existing `BlobSidecar` related types to support blinded blobs.

* Add associated types for BlockProposal

* Rename `AbstractSidecar` to `Sidecar`

* Remove blob cache as it's no longer necessary

* Remove unnecessary enum variant

* Clean up

* Hanlde unblinded blobs and publish full block contents

* Fix tests

* Add local EL blobs caching in blinded flow

* Remove BlockProposal and move associated Sidecar trait to AbstractExecPayload to simplify changes

* add blob roots associated type

* move raw blobs associated type to sidecar trait

* Fix todos and improve error handling

* Consolidate BlobsBundle from `execution_layer` into `consensus/types`

* Rename RawBlobs, Blobs, and BlobRoots

* Use `BlobRoots` type alias

* Update error message.

Co-authored-by: realbigsean <seananderson33@GMAIL.com>

* update builder bid type

# Conflicts:
#	consensus/types/src/builder_bid.rs

* Fix lint

* remove generic from builder bid

---------

Co-authored-by: realbigsean <seananderson33@gmail.com>

beacon_node/builder_client/src/lib.rs

@@ -1,8 +1,8 @@
 use eth2::types::builder_bid::SignedBuilderBid;
+use eth2::types::payload::FullPayloadContents;
 use eth2::types::{
-    AbstractExecPayload, BlindedPayload, EthSpec, ExecutionBlockHash, ExecutionPayload,
-    ForkVersionedResponse, PublicKeyBytes, SignedBlockContents, SignedValidatorRegistrationData,
-    Slot,
+    BlindedPayload, EthSpec, ExecutionBlockHash, ForkVersionedResponse, PublicKeyBytes,
+    SignedBlockContents, SignedValidatorRegistrationData, Slot,
 };
 pub use eth2::Error;
 use eth2::{ok_or_error, StatusCode};
@@ -141,7 +141,7 @@ impl BuilderHttpClient {
     pub async fn post_builder_blinded_blocks<E: EthSpec>(
         &self,
         blinded_block: &SignedBlockContents<E, BlindedPayload<E>>,
-    ) -> Result<ForkVersionedResponse<ExecutionPayload<E>>, Error> {
+    ) -> Result<ForkVersionedResponse<FullPayloadContents<E>>, Error> {
         let mut path = self.server.full.clone();
 
         path.path_segments_mut()
@@ -163,12 +163,12 @@ impl BuilderHttpClient {
     }
 
     /// `GET /eth/v1/builder/header`
-    pub async fn get_builder_header<E: EthSpec, Payload: AbstractExecPayload<E>>(
+    pub async fn get_builder_header<E: EthSpec>(
         &self,
         slot: Slot,
         parent_hash: ExecutionBlockHash,
         pubkey: &PublicKeyBytes,
-    ) -> Result<Option<ForkVersionedResponse<SignedBuilderBid<E, Payload>>>, Error> {
+    ) -> Result<Option<ForkVersionedResponse<SignedBuilderBid<E>>>, Error> {
         let mut path = self.server.full.clone();
 
         path.path_segments_mut()