Support solc v0.8.31 (#430)

- Support for solc v0.8.31.
- Support for the `clz` Yul builtin.

---------

Signed-off-by: xermicus <cyrill@parity.io>

crates/differential/genesis.json

@@ -15,6 +15,8 @@
         "grayGlacierBlock": 0,
         "shanghaiTime": 0,
         "cancunTime": 0,
+        "pragueTime": 0,
+        "osakaTime": 0,
         "terminalTotalDifficulty": 0,
         "terminalTotalDifficultyPassed": true,
         "blobSchedule": {
@@ -22,6 +24,16 @@
                 "target": 3,
                 "max": 6,
                 "baseFeeUpdateFraction": 3338477
+            },
+            "prague": {
+                "target": 6,
+                "max": 9,
+                "baseFeeUpdateFraction": 5007716
+            },
+            "osaka": {
+                "target": 6,
+                "max": 9,
+                "baseFeeUpdateFraction": 5007716
             }
         }
     },
@@ -44,4 +56,4 @@
             "balance": "1000000000"
         }
     }
-}
+}