test: add test for readwrite issue

test the previous commit: Don’t break too early in readwrite mode

In rw mode if io_size > size An early reset of the addresses occurred.
Make sure all addresses are done correctly.

Signed-off-by: Chana-Zaks-wdc <chana.zaks@wdc.com>
Link: https://lore.kernel.org/r/20240418092222.20543-3-chana.zaks@wdc.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

t/jobs/t0032-43063a1c.fio

@@ -0,0 +1,12 @@
+# Expected results: max offset is ~1280K
+# Buggy result: max offset is ~640K
+#
+
+[global]
+ioengine=null
+size=1280K
+io_size=2560k
+bs=128K
+
+[test1]
+rw=rw