[#10776] Add /metricDef/userDefined api logic.

[minwoo-jung]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 59 lines in your changes missing coverage. Please review.

Project coverage is 36.92%. Comparing base (603a0f0) to head (c995fd9).

Files	Patch %	Lines
...tlp/web/dao/mysql/MysqlAppMetricDefinitionDao.java	0.00%	22 Missing ⚠️
...nfig/mysql/OtlpMetricWebMysqlDaoConfiguration.java	0.00%	16 Missing ⚠️
...lp/web/service/AppMetricDefinitionServiceImpl.java	0.00%	7 Missing ⚠️
...tlp/web/controller/MetricDefinitionController.java	0.00%	6 Missing ⚠️
...b/config/mysql/OtlpMetricMysqlRegistryHandler.java	0.00%	5 Missing ⚠️
...b/config/pinot/OtlpMetricPinotRegistryHandler.java	0.00%	1 Missing ⚠️
...nfig/pinot/OtlpMetricWebPinotDaoConfiguration.java	0.00%	1 Missing ⚠️
...p/pinpoint/otlp/web/dao/model/AppMetricDefDto.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #11281      +/-   ##
============================================
- Coverage     36.93%   36.92%   -0.02%     
- Complexity    12066    12067       +1     
============================================
  Files          4005     4010       +5     
  Lines         98188    98242      +54     
  Branches      10417    10417              
============================================
+ Hits          36266    36272       +6     
- Misses        58959    59008      +49     
+ Partials       2963     2962       -1     

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