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>

common/eth2/src/lib.rs

@@ -727,7 +727,7 @@ impl BeaconNodeHttpClient {
     /// Returns `Ok(None)` on a 404 error.
     pub async fn post_beacon_blinded_blocks<T: EthSpec, Payload: AbstractExecPayload<T>>(
         &self,
-        block: &SignedBeaconBlock<T, Payload>,
+        block: &SignedBlockContents<T, Payload>,
     ) -> Result<(), Error> {
         let mut path = self.eth_path(V1)?;
 
@@ -1648,7 +1648,7 @@ impl BeaconNodeHttpClient {
         slot: Slot,
         randao_reveal: &SignatureBytes,
         graffiti: Option<&Graffiti>,
-    ) -> Result<ForkVersionedResponse<BeaconBlock<T, Payload>>, Error> {
+    ) -> Result<ForkVersionedResponse<BlockContents<T, Payload>>, Error> {
         self.get_validator_blinded_blocks_modular(
             slot,
             randao_reveal,
@@ -1668,7 +1668,7 @@ impl BeaconNodeHttpClient {
         randao_reveal: &SignatureBytes,
         graffiti: Option<&Graffiti>,
         skip_randao_verification: SkipRandaoVerification,
-    ) -> Result<ForkVersionedResponse<BeaconBlock<T, Payload>>, Error> {
+    ) -> Result<ForkVersionedResponse<BlockContents<T, Payload>>, Error> {
         let mut path = self.eth_path(V1)?;
 
         path.path_segments_mut()