support metrics

[crossoverJie]

Reference to the Go SDK implementation.

Monitor pulsar status on the application side using Prometheus and Grafana.

Some of the data is implemented through interceptors, so need to open the interceptor configuration.

pulsar.allow-interceptor=true

[codecov[bot]]

Codecov Report

Merging #277 (ba6bd86) into master (71ae35c) will increase coverage by 2.18%. The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #277      +/-   ##
============================================
+ Coverage     85.65%   87.83%   +2.18%     
- Complexity      162      181      +19     
============================================
  Files            19       21       +2     
  Lines           467      518      +51     
  Branches         26       26              
============================================
+ Hits            400      455      +55     
+ Misses           53       49       -4     
  Partials         14       14              

Impacted Files	Coverage Δ
...ub/majusko/pulsar/consumer/ConsumerAggregator.java	92.66% <100.00%> (+0.27%)	:arrow_up:
...ko/pulsar/consumer/DefaultConsumerInterceptor.java	62.96% <100.00%> (+12.96%)	:arrow_up:
...java/io/github/majusko/pulsar/metrics/Metrics.java	100.00% <100.00%> (ø)
...o/github/majusko/pulsar/metrics/MetricsConfig.java	100.00% <100.00%> (ø)
...ko/pulsar/producer/DefaultProducerInterceptor.java	71.42% <100.00%> (+15.87%)	:arrow_up:
...ithub/majusko/pulsar/producer/ProducerFactory.java	84.61% <100.00%> (+1.28%)	:arrow_up:

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