[isoltest] Extract event specific end-to-end tests.

test/libsolidity/semanticTests/events/event_dynamic_array_memory.sol

@@ -0,0 +1,15 @@
+contract C {
+    event E(uint[]);
+    function createEvent(uint x) public {
+        uint[] memory arr = new uint[](3);
+        arr[0] = x;
+        arr[1] = x + 1;
+        arr[2] = x + 2;
+        emit E(arr);
+    }
+}
+// ====
+// compileViaYul: also
+// ----
+// createEvent(uint256): 42 ->
+// ~ emit E(uint256[]): 0x20, 0x03, 0x2a, 0x2b, 0x2c