Split StorageSlot into TransientSlot (#5239)

Co-authored-by: Hadrien Croubois <hadrien.croubois@gmail.com>

scripts/generate/templates/TransientSlotMock.js

@@ -0,0 +1,35 @@
+const format = require('../format-lines');
+const { TYPES } = require('./Slot.opts');
+
+const header = `\
+pragma solidity ^0.8.24;
+
+import {Multicall} from "../utils/Multicall.sol";
+import {TransientSlot} from "../utils/TransientSlot.sol";
+`;
+
+const transient = ({ type, name }) => `\
+event ${name}Value(bytes32 slot, ${type} value);
+
+function tload${name}(bytes32 slot) public {
+    emit ${name}Value(slot, slot.as${name}().tload());
+}
+
+function tstore(bytes32 slot, ${type} value) public {
+    slot.as${name}().tstore(value);
+}
+`;
+
+// GENERATE
+module.exports = format(
+  header,
+  'contract TransientSlotMock is Multicall {',
+  format(
+    [].concat(
+      'using TransientSlot for *;',
+      '',
+      TYPES.filter(type => type.isValueType).map(type => transient(type)),
+    ),
+  ).trimEnd(),
+  '}',
+);