[ISSUE #46] support prometheus collect lmq write read rt metrics

[tianliuliu]

fix #46 support prometheus collect lmq write read rt metrics and use GAUGE type to monitor rt

[codecov-commenter]

Codecov Report

Merging #47 (b053cfe) into main (ab353d0) will increase coverage by 0.01%.
The diff coverage is 22.22%.

@@            Coverage Diff             @@
##             main      #47      +/-   ##
==========================================
+ Coverage   21.95%   21.97%   +0.01%     
==========================================
  Files          96       96              
  Lines        4154     4178      +24     
  Branches      663      663              
==========================================
+ Hits          912      918       +6     
- Misses       3017     3035      +18     
  Partials      225      225              

Impacted Files	Coverage Δ
...e/rocketmq/mqtt/ds/store/LmqQueueStoreManager.java	26.04% <0.00%> (-1.68%)	⬇️
.../mqtt/exporter/collector/MqttMetricsCollector.java	0.00% <0.00%> (ø)
...ketmq/mqtt/exporter/collector/MqttMetricsInfo.java	0.00% <0.00%> (ø)
.../apache/rocketmq/mqtt/ds/meta/WildcardManager.java	72.41% <85.71%> (+0.41%)	⬆️

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