[Multi-Database Support] package postgre h2 dependency]

[shoothzj]

What's the purpose of this PR

To support multi database, package postgre、h2 dependency in package.

Brief changelog

Add postgre、h2 in the apollo-common pom.xml

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• Read the Contributing Guide before making this pull request.
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• Write necessary unit tests to verify the code.
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• Update the CHANGES log.

[codecov]

Codecov Report

Merging #4763 (0b84512) into master (a76521e) will increase coverage by 0.05%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #4763      +/-   ##
============================================
+ Coverage     47.27%   47.32%   +0.05%     
- Complexity     1655     1659       +4     
============================================
  Files           346      346              
  Lines         10662    10662              
  Branches       1058     1058              
============================================
+ Hits           5040     5046       +6     
+ Misses         5316     5309       -7     
- Partials        306      307       +1     

Impacted Files	Coverage Δ
...m/ctrip/framework/apollo/biz/entity/AccessKey.java	58.33% <ø> (ø)
...a/com/ctrip/framework/apollo/biz/entity/Audit.java	52.94% <ø> (ø)
...com/ctrip/framework/apollo/biz/entity/Cluster.java	58.82% <ø> (ø)
.../com/ctrip/framework/apollo/biz/entity/Commit.java	5.55% <ø> (ø)
...p/framework/apollo/biz/entity/GrayReleaseRule.java	100.00% <ø> (ø)
...va/com/ctrip/framework/apollo/biz/entity/Item.java	86.36% <ø> (ø)
...m/ctrip/framework/apollo/biz/entity/Namespace.java	61.11% <ø> (ø)
...rip/framework/apollo/biz/entity/NamespaceLock.java	25.00% <ø> (ø)
...m/ctrip/framework/apollo/biz/entity/Privilege.java	8.33% <ø> (ø)
...com/ctrip/framework/apollo/biz/entity/Release.java	82.14% <ø> (ø)
... and 16 more

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[nobodyiam]

LGTM