Fix some types in transaction schema (#552)

* Fix transaction type for EIP-4844 transaction.

According to https://github.com/ethereum/EIPs/blob/master/EIPS/eip-4844.md
The type should be `Bytes1(0x03)`

* Fix missing required fields in AccessListEntry

According to https://eips.ethereum.org/EIPS/eip-2930
> For the transaction to be valid, accessList must be of type [[{20 bytes}, [{32 bytes}...]]...]

Author: pgherveou

src/schemas/transaction.yaml

@@ -17,7 +17,8 @@ Transaction4844Unsigned:
   properties:
     type:
       title: type
-      $ref: '#/components/schemas/byte'
+      type: string
+      pattern: ^0x3$
     nonce:
       title: nonce
       $ref: '#/components/schemas/uint'
@@ -63,6 +64,9 @@ AccessListEntry:
   title: Access list entry
   type: object
   additionalProperties: false
+  required: 
+    - address
+    - storageKeys
   properties:
     address:
       $ref: '#/components/schemas/address'