sysbench: add page (#8797)

pages/common/sysbench.md

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+# sysbench
+
+> Benchmark a System's CPU, IO and memory.
+> More information: <https://github.com/akopytov/sysbench/>.
+
+- Run a CPU benchmark with 1 thread for 10 seconds:
+
+`sysbench cpu run`
+
+- Run a CPU benchmark with multiple threads for a specified time:
+
+`sysbench --threads={{number_of_threads}} --time={{seconds}}`
+
+- Run a memory benchmark with 1 thread for 10 seconds:
+
+`sysbench memory run`
+
+- Prepare a filesystem-level read benchmark:
+
+`sysbench fileio prepare`
+
+- Run a filesystem-level benchmark:
+
+`sysbench --file-test-mode={{rndrd|rndrw|rndwr|seqrd|seqrewr|seqwr}} fileio run`