[perf]: More precise producer rate limiter

[Gleiphir2769]

Motivation

Currently, when the rate of the producer is set relatively small, the actual production rate is not accurate.

For example.

$ ./pulsar-perf-old produce my-test-r1 -r 1

INFO[17:20:12.524] Stats - Publish rate:    2.9 msg/s -    0.0 Mbps - 
                                Latency ms: 50%   3.8 -95% 1004.0 - 99% 1004.3 - 99.9% 1004.3 - max 1005.2 
INFO[17:20:22.523] Stats - Publish rate:    3.0 msg/s -    0.0 Mbps - 
                                Latency ms: 50%   3.8 -95% 1004.0 - 99% 1004.2 - 99.9% 1004.2 - max 1004.9 
INFO[17:20:32.523] Stats - Publish rate:    3.0 msg/s -    0.0 Mbps - 
                                Latency ms: 50%   3.9 -95% 1004.0 - 99% 1004.0 - 99.9% 1004.0 - max 1004.1 

$ ./pulsar-perf-old produce my-test-r1 -r 5

INFO[17:27:33.597] Stats - Publish rate:    6.9 msg/s -    0.1 Mbps - 
                                Latency ms: 50%   4.0 -95% 1004.1 - 99% 1005.0 - 99.9% 1005.0 - max 1019.0 
INFO[17:27:43.596] Stats - Publish rate:    7.0 msg/s -    0.1 Mbps - 
                                Latency ms: 50%   4.7 -95% 1004.9 - 99% 1006.0 - 99.9% 1006.0 - max 1006.3 
INFO[17:27:53.596] Stats - Publish rate:    7.0 msg/s -    0.1 Mbps - 
                                Latency ms: 50%   4.0 -95% 1004.0 - 99% 1004.9 - 99.9% 1004.9 - max 1005.5 
INFO[17:28:03.588] Stats - Publish rate:    7.0 msg/s -    0.1 Mbps - 
                                Latency ms: 50%   5.0 -95% 1005.1 - 99% 1008.1 - 99.9% 1008.1 - max 1015.5

After modify the rate limiter, the result can be improved as that.

$ ./pulsar-perf produce my-test-r1 -r 1

INFO[17:22:45.971] Stats - Publish rate:    1.0 msg/s -    0.0 Mbps - 
                                Latency ms: 50% 1004.4 -95% 1005.1 - 99% 1005.1 - 99.9% 1005.1 - max 1006.2 
INFO[17:22:55.971] Stats - Publish rate:    1.0 msg/s -    0.0 Mbps - 
                                Latency ms: 50% 1004.2 -95% 1007.4 - 99% 1007.4 - 99.9% 1007.4 - max 1008.0 
INFO[17:23:05.971] Stats - Publish rate:    1.0 msg/s -    0.0 Mbps - 
                                Latency ms: 50% 1003.4 -95% 1004.7 - 99% 1004.7 - 99.9% 1004.7 - max 1008.1 
INFO[17:23:15.971] Stats - Publish rate:    1.0 msg/s -    0.0 Mbps - 
                                Latency ms: 50% 1003.5 -95% 1004.3 - 99% 1004.3 - 99.9% 1004.3 - max 1004.6 

$ ./pulsar-perf produce my-test-r1 -r 5

INFO[17:29:07.675] Stats - Publish rate:    5.4 msg/s -    0.0 Mbps - 
                                Latency ms: 50% 203.5 -95% 204.6 - 99% 206.3 - 99.9% 206.3 - max  207.3 
INFO[17:29:17.675] Stats - Publish rate:    5.0 msg/s -    0.0 Mbps - 
                                Latency ms: 50% 203.8 -95% 205.5 - 99% 206.2 - 99.9% 206.2 - max  206.3 
INFO[17:29:27.675] Stats - Publish rate:    5.0 msg/s -    0.0 Mbps - 
                                Latency ms: 50% 203.7 -95% 204.7 - 99% 207.4 - 99.9% 207.4 - max  220.8 
INFO[17:29:37.675] Stats - Publish rate:    5.0 msg/s -    0.0 Mbps - 
                                Latency ms: 50% 203.6 -95% 204.3 - 99% 204.4 - 99.9% 204.4 - max  204.5 

Modifications

• Use the "golang.org/x/time/rate" as producer limiter.

Verifying this change

• Make sure that the change passes the CI checks.