[ISSUE #7697]Fix can't open controller metricsExporter.

[baijun44]

Which Issue(s) This PR Fixes

Fixes #7697

Brief Description

add two set methods for field metricsExporterType in order to make config 'metricsExporterType' work.

How Did You Test This Change?

1.add a config "metricsExporterType = PROM" for controller
2.open localhost:5557/metrics and can get metrics info.

[codecov-commenter]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (59e8f9b) 43.17% compared to head (454a3aa) 43.14%.
Report is 1 commits behind head on develop.

Files	Patch %	Lines
...a/org/apache/rocketmq/common/ControllerConfig.java	0.00%	4 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #7705      +/-   ##
=============================================
- Coverage      43.17%   43.14%   -0.03%     
+ Complexity      9812     9801      -11     
=============================================
  Files           1165     1165              
  Lines          84542    84546       +4     
  Branches       10979    10979              
=============================================
- Hits           36502    36480      -22     
- Misses         43497    43521      +24     
- Partials        4543     4545       +2     

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[iamgd67]

dumplicate to #7492