Add Electra blob sidecars type to support max blobs from EIP-7691 (#488)

* Add Electra blob sidecars type to support max blobs from EIP-7691

* Eth-Consensus-Version header is required now

* More conistent formatting

* Remove some formatting changes to keep diff minimal

---------

Co-authored-by: Paul Harris <[email protected]>

Author: nflaig

apis/beacon/blob_sidecars/blob_sidecars.yaml

@@ -29,13 +29,12 @@ get:
       headers:
         Eth-Consensus-Version:
           $ref: '../../../beacon-node-oapi.yaml#/components/headers/Eth-Consensus-Version'
-          required: false
       content:
         application/json:
           schema:
             title: GetBlobSidecarsResponse
             type: object
-            required: [data]
+            required: [version, execution_optimistic, finalized, data]
             properties:
               version:
                 type: string
@@ -46,7 +45,9 @@ get:
               finalized:
                 $ref: "../../../beacon-node-oapi.yaml#/components/schemas/Finalized"
               data:
-                $ref: "../../../beacon-node-oapi.yaml#/components/schemas/Deneb.BlobSidecars"
+                anyOf:
+                  - $ref: "../../../beacon-node-oapi.yaml#/components/schemas/Deneb.BlobSidecars"
+                  - $ref: "../../../beacon-node-oapi.yaml#/components/schemas/Electra.BlobSidecars"
         application/octet-stream:
           schema:
             description: "SSZ serialized `BlobSidecars` bytes. Use Accept header to choose this response type"

beacon-node-oapi.yaml

@@ -423,6 +423,8 @@ components:
       $ref: './types/electra/light_client.yaml#/Electra/LightClientFinalityUpdate'
     Electra.LightClientOptimisticUpdate:
       $ref: './types/electra/light_client.yaml#/Electra/LightClientOptimisticUpdate'
+    Electra.BlobSidecars:
+      $ref: './types/electra/blob_sidecar.yaml#/Electra/BlobSidecars'
     Node:
       $ref: './types/fork_choice.yaml#/Node'
     ExtraData:

types/electra/blob_sidecar.yaml

@@ -0,0 +1,7 @@
+Electra:
+  BlobSidecars:
+    type: array
+    items:
+      $ref: "../deneb/blob_sidecar.yaml#/Deneb/BlobSidecar"
+    minItems: 0
+    maxItems: 9