v1: builder proposer endpoint (#4)

* v1: builder proposer endpoint
* rename DVT to DV

apis/validator/proposer_config.yaml

@@ -0,0 +1,24 @@
+get:
+  tags:
+    - ValidatorRequiredApi
+    - Validator
+  operationId: "proposerConfig"
+  summary: "Produce a proposer config"
+  description: |
+    Requests the beacon node or DV middleware to produce the proposer config. The proposer_config enables validator registrations
+    for distributed validator (DV) middleware clients.
+  responses:
+    "200":
+      description: Success response
+      content:
+        application/json:
+          schema:
+            title: ProposerConfigResponse
+            type: object
+            properties:
+              data:
+                $ref: '../../beacon-node-oapi.yaml#/components/schemas/ProposerConfig'
+    "400":
+      $ref: '../../beacon-node-oapi.yaml#/components/responses/InvalidRequest'
+    "500":
+      $ref: '../../beacon-node-oapi.yaml#/components/responses/InternalError'

beacon-node-oapi.yaml

@@ -188,6 +188,8 @@ paths:
     $ref: "./apis/validator/sync_committee_contribution.yaml"
   /eth/v1/validator/sync_committee_selections:
     $ref: "./apis/validator/sync_committee_selections.yaml"
+  /eth/v1/validator/proposer_config:
+    $ref: "./apis/validator/proposer_config.yaml"
   /eth/v1/validator/contribution_and_proofs:
     $ref: "./apis/validator/sync_committee_contribution_and_proof.yaml"
   /eth/v1/validator/prepare_beacon_proposer:
@@ -245,6 +247,8 @@ components:
       $ref: './types/selection.yaml#/BeaconCommitteeSelection'
     SyncCommitteeSelection:
       $ref: './types/selection.yaml#/SyncCommitteeSelection'
+    ProposerConfig:
+      $ref: './types/proposer_config.yaml#/BuilderProposerConfig'
     Fork:
       $ref: './types/misc.yaml#/Fork'
     Checkpoint:

types/proposer_config.yaml

@@ -0,0 +1,68 @@
+BuilderProposerConfig:
+  type: object
+  required: ["default_config"]
+  properties:
+    default_config:
+      allOf:
+        - $ref: './proposer_config.yaml#/DefaultConfig'
+    proposer_config:
+      allOf:
+        - $ref: './proposer_config.yaml#/ProposerConfig'
+
+DefaultConfig:
+  type: object
+  description: "A default proposer configuration contains all default values to be applied to every validator. These values can be overridden for specific validators in proposer_config."
+  properties:
+    fee_recipient:
+      allOf:
+        - $ref: "./primitive.yaml#/ExecutionAddress"
+        - example: "0xabcf8e0d4e9587369b2301d0790347320302cc09"
+        - description: "Fee-recipient address"
+    builder:
+      allOf:
+        - $ref: './proposer_config.yaml#/Builder'
+
+ProposerConfig:
+  description: "A proposer configuration for multiple validator public keys. This overrides default config for selected validators."
+  type: array
+  items:
+    type: object
+    properties:
+      public_key:
+        allOf:
+          - $ref: "./primitive.yaml#/Pubkey"
+          - description: "The validator to override values for"
+      fee_recipient:
+        allOf:
+          - $ref: "./primitive.yaml#/ExecutionAddress"
+          - example: "0xabcf8e0d4e9587369b2301d0790347320302cc09"
+          - description: "Fee-recipient address"
+      builder:
+        allOf:
+          - $ref: './proposer_config.yaml#/Builder'
+
+Builder:
+  type: object
+  description: "The builder network configuration."
+  properties:
+    enabled:
+      allOf:
+        - type: boolean
+        - example: false
+    gas_limit:
+      allOf:
+        - $ref: "./primitive.yaml#/Uint256"
+    registration_overrides:
+      allOf:
+        - $ref: './proposer_config.yaml#/RegistrationOverrides'
+
+RegistrationOverrides:
+  type: object
+  description: "Fields for overriding validator registrations"
+  properties:
+    timestamp:
+      allOf:
+        - $ref: "./primitive.yaml#/Uint64"
+    public_key:
+      allOf:
+        - $ref: "./primitive.yaml#/Pubkey"