implement block.number and block.timestamp

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

crates/integration/contracts/Block.sol

@@ -0,0 +1,13 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity ^0.8.24;
+
+contract Block {
+    function timestamp() public view returns (uint ret) {
+        ret = block.timestamp;
+    }
+
+    function number() public view returns (uint ret) {
+        ret = block.number;
+    }
+}