Add EIP-7251 to Prague (#532)

* Add amount to ExitV1

* Wording

* engine/prague: use quantity instead of data for amount

---------

Co-authored-by: lightclient <[email protected]>

Author: ensi321

src/engine/openrpc/schemas/payload.yaml

@@ -380,10 +380,14 @@ ExitV1:
   required:
     - sourceAddress
     - validatorPublicKey
+    - amount
   properties:
     sourceAddress:
       title: Source address
       $ref: '#/components/schemas/address'
     validatorPublicKey:
       title: Validator public key
       $ref: '#/components/schemas/bytes48'
+    amount:
+      title: Withdraw amount
+      $ref: '#/components/schemas/uint64'

src/engine/prague.md

@@ -48,6 +48,9 @@ The fields are encoded as follows:
 
 - `sourceAddress`: `DATA`, 20 Bytes
 - `validatorPublicKey`: `DATA`, 48 Bytes
+- `amount`: `QUANTITY`, 64 Bits
+
+*Note:* The `amount` value is represented in Gwei.
 
 ### ExecutionPayloadV4