feat: add ResourceKind enum and fix comments

Author: MishkaRogachev

ArbOwner.sol

@@ -259,7 +259,7 @@ interface ArbOwner {
     ) external;
 
     /// @notice Adds or updates a resource constraint
-    /// @notice Available on ArbOS version 50 and above
+    /// @notice Available on ArbOS version 60 and above
     /// @param resources an array of resource–weight pairs (see Nitro documentation for the list of resources)
     /// @param periodSecs the time window for the constraint
     /// @param targetPerSec allowed usage per second across weighted resources
@@ -270,10 +270,13 @@ interface ArbOwner {
     ) external;
 
     /// @notice Removes a resource constraint
-    /// @notice Available on ArbOS version 50 and above
+    /// @notice Available on ArbOS version 60 and above
     /// @param resources the list of resource kinds to be removed (see Nitro documentation for the list of resources)
     /// @param periodSecs the time window for the constraint
-    function clearConstraint(uint8[] calldata resources, uint32 periodSecs) external;
+    function clearConstraint(
+        ArbResourceConstraintsTypes.ResourceKind[] calldata resources,
+        uint32 periodSecs
+    ) external;
 
     /// Emitted when a successful call is made to this precompile
     event OwnerActs(bytes4 indexed method, address indexed owner, bytes data);

ArbResourceConstraintsTypes.sol

@@ -7,9 +7,23 @@ pragma solidity >=0.4.21 <0.9.0;
 /// @title ArbResourceConstraintsTypes
 /// @notice Resource constraints type definitions used by ArbOwner and ArbOwnerPublic precompiles.
 library ArbResourceConstraintsTypes {
+    /// @notice Enumerates the distinct resource kinds used for multi-dimensional gas accounting.
+    /// @dev The numeric values of this enum must remain consistent with the corresponding
+    /// @dev The values defined here must stay synchronized with `go-ethereum/arbitrum/multigas/resources.go`.
+    enum ResourceKind {
+        Unknown,
+        Computation,
+        HistoryGrowth,
+        StorageAccess,
+        StorageGrowth,
+        L1Calldata,
+        L2Calldata,
+        WasmComputation
+    }
+
     /// @notice A pair representing a resource kind and its weight in constraint calculations.
     struct ResourceWeight {
-        uint8 resource;
+        ResourceKind resource;
         uint64 weight;
     }
 
@@ -18,6 +32,5 @@ library ArbResourceConstraintsTypes {
         ResourceWeight[] resources;
         uint32 periodSecs;
         uint64 targetPerSec;
-        uint64 backlog;
     }
 }