redis-benchmark: add page (#8962)

pages/common/redis-benchmark.md

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+# redis-benchmark
+
+> A tool to benchmark a Redis server.
+> More information: <https://redis.io/docs/reference/optimization/benchmarks/>.
+
+- Run full benchmark:
+
+`redis-benchmark`
+
+- Run benchmark on a specific Redis server:
+
+`redis-benchmark -h {{host}} -p {{port}} -a {{password}}`
+
+- Run a subset of tests with default 100000 requests:
+
+`redis-benchmark -h {{host}} -p {{port}} -t {{set,lpush}} -n {{100000}}`
+
+- Run with a specific script:
+
+`redis-benchmark -n {{100000}} script load "{{redis.call('set', 'foo', 'bar')}}"`
+
+- Run benchmark by using 100000 [r]andom keys:
+
+`redis-benchmark -t {{set}} -r {{100000}}`
+
+- Run benchmark by using a [P]ipelining of 16 commands:
+
+`redis-benchmark -n {{1000000}} -t {{set,get}} -P {{16}}`
+
+- Run benchmark [q]uietly and only show query per seconds result:
+
+`redis-benchmark -q`