[DECOUPLING] Implement BlobSidecarByRange RPC method

[mehdi-aouadi]

BlobsSidecarsByRange v1
Protocol ID: /eth2/beacon_chain/req/blobs_sidecars_by_range/1/

Request Content:

(
  start_slot: Slot
  count: uint64
)
Response Content:

class BlobSidecars(Container):
    sidecars: List[BlobSidecar, MAX_BLOBS_PER_BLOCK] # TODO verify constant name

(
  List[BlobSidecars, MAX_REQUEST_BLOBS_SIDECARS]
)