[#10776] Add api to get defined Metric list

[minwoo-jung]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 36.92%. Comparing base (9de7e93) to head (d4eb29a).

Files	Patch %	Lines
...tlp/web/dao/mysql/MysqlAppMetricDefinitionDao.java	0.00%	3 Missing ⚠️
...tlp/web/controller/MetricDefinitionController.java	0.00%	1 Missing ⚠️
...p/pinpoint/otlp/web/dao/model/AppMetricDefDto.java	0.00%	1 Missing ⚠️
...lp/web/service/AppMetricDefinitionServiceImpl.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #11284      +/-   ##
============================================
- Coverage     36.93%   36.92%   -0.01%     
- Complexity    12072    12073       +1     
============================================
  Files          4010     4010              
  Lines         98242    98246       +4     
  Branches      10417    10417              
============================================
- Hits          36285    36282       -3     
- Misses        58991    58999       +8     
+ Partials       2966     2965       -1     

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