[CELEBORN-1054] Support DB based ConfigService

[SteNicholas]

What changes were proposed in this pull request?

DbConfigServiceImpl supports database based store backend implementation.

Why are the changes needed?

ConfigService interface is introduced for dynamic config at present. Meanwhile, this interface provides FsConfigServiceImpl that is the filesytem store backend. We could support database based store backend implementation.

Does this PR introduce any user-facing change?

No.

How was this patch tested?

ConfigServiceSuiteJ

[codecov]

Codecov Report

Attention: 55 lines in your changes are missing coverage. Please review.

Comparison is base (8a15396) 47.13% compared to head (32f35ff) 47.51%.

Files	Patch %	Lines
...ver/common/service/config/DbConfigServiceImpl.java	67.71%	19 Missing and 12 partials ⚠️
...ver/common/service/config/FsConfigServiceImpl.java	50.00%	13 Missing and 3 partials ⚠️
...r/common/service/config/BaseConfigServiceImpl.java	89.48%	1 Missing and 3 partials ⚠️
...rn/server/common/service/config/DynamicConfig.java	60.00%	1 Missing and 1 partial ⚠️
...on/service/config/DynamicConfigServiceFactory.java	66.67%	0 Missing and 1 partial ⚠️
...orn/server/common/service/config/TenantConfig.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2124      +/-   ##
==========================================
+ Coverage   47.13%   47.51%   +0.38%     
==========================================
  Files         173      176       +3     
  Lines       11034    11182     +148     
  Branches     1011     1031      +20     
==========================================
+ Hits         5200     5312     +112     
- Misses       5494     5511      +17     
- Partials      340      359      +19     

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