feat(forks): Add max request type to fork

Author: marioevz

src/ethereum_test_forks/base_fork.py

@@ -317,6 +317,14 @@ def create_opcodes(
         """
         pass
 
+    @classmethod
+    @abstractmethod
+    def max_request_type(cls, block_number: int = 0, timestamp: int = 0) -> int:
+        """
+        Returns the max request type supported by the fork.
+        """
+        pass
+
     # Meta information about the fork
     @classmethod
     def name(cls) -> str:

src/ethereum_test_forks/forks/forks.py

@@ -357,6 +357,13 @@ def create_opcodes(
             (Opcodes.CREATE, EVMCodeType.LEGACY),
         ]
 
+    @classmethod
+    def max_request_type(cls, block_number: int = 0, timestamp: int = 0) -> int:
+        """
+        At genesis, no request type is supported, signaled by -1
+        """
+        return -1
+
     @classmethod
     def pre_allocation(cls) -> Mapping:
         """
@@ -862,6 +869,13 @@ def system_contracts(cls, block_number: int = 0, timestamp: int = 0) -> List[Add
             SystemContract.BLOCK_HISTORY_CONTRACT,
         ] + super(Prague, cls).system_contracts(block_number, timestamp)
 
+    @classmethod
+    def max_request_type(cls, block_number: int = 0, timestamp: int = 0) -> int:
+        """
+        At Prague, three request types are introduced, hence the max request type is 2
+        """
+        return 2
+
     @classmethod
     def pre_allocation_blockchain(cls) -> Mapping:
         """