feat: add object fraq command

Signed-off-by: rfyiamcool <[email protected]>

Author: rfyiamcool

commands_test.go

@@ -676,7 +676,7 @@ var _ = Describe("Commands", func() {
 			Expect(refCount.Val()).To(Equal(int64(1)))
 
 			freq := client.ObjectFreq(ctx, "key")
-			Expect(freq.Err()).To(MatchError("LFU maxmemory policy is not selected"))
+			Expect(freq.Err()).To(MatchError(ContainSubstring("LFU maxmemory policy is not selected")))
 
 			err := client.ObjectEncoding(ctx, "key").Err()
 			Expect(err).NotTo(HaveOccurred())