新增对halo数据库的支持

[HaloLab001]

您好,halo是我司推出的一款关系型数据库,因使用druid出现无法找到halo这个数据库驱动,因此合并代码进行适配

[CLAassistant]

All committers have signed the CLA.

[CLAassistant]

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1 out of 2 committers have signed the CLA.

✅ HaloLab001
❌ zhoulanqing

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[lizongbo]

哪里有这个数据库的详细介绍？driver class是可以自己配置，不一定需要加默认识别适配

[codecov-commenter]

Codecov Report

Attention: 1436 lines in your changes are missing coverage. Please review.

Comparison is base (1c89d31) 58.79% compared to head (ead80e0) 58.68%.
Report is 345 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5632      +/-   ##
============================================
- Coverage     58.79%   58.68%   -0.11%     
- Complexity    27033    27698     +665     
============================================
  Files          1282     1331      +49     
  Lines        123622   127444    +3822     
  Branches      23288    23991     +703     
============================================
+ Hits          72680    74787    +2107     
- Misses        41854    43340    +1486     
- Partials       9088     9317     +229     

Files	Coverage Δ
core/src/main/java/com/alibaba/druid/DbType.java	92.30% <100.00%> (+0.30%)	⬆️
core/src/main/java/com/alibaba/druid/VERSION.java	50.00% <ø> (ø)
...a/com/alibaba/druid/pool/DruidPooledStatement.java	68.28% <100.00%> (ø)
...om/alibaba/druid/pool/PreparedStatementHolder.java	90.62% <100.00%> (-9.38%)	⬇️
...ol/ha/selector/StickyRandomDataSourceSelector.java	0.00% <ø> (ø)
...druid/pool/vendor/MySqlValidConnectionChecker.java	76.19% <100.00%> (+25.31%)	⬆️
...a/druid/proxy/jdbc/CallableStatementProxyImpl.java	99.55% <100.00%> (+0.72%)	⬆️
...a/com/alibaba/druid/proxy/jdbc/NClobProxyImpl.java	100.00% <ø> (+20.00%)	⬆️
...a/druid/proxy/jdbc/PreparedStatementProxyImpl.java	91.07% <100.00%> (+2.66%)	⬆️
...m/alibaba/druid/proxy/jdbc/StatementProxyImpl.java	94.03% <100.00%> (-0.32%)	⬇️
... and 76 more

... and 177 files with indirect coverage changes

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[lizongbo]

代码存在冲突，请解决冲突后重新提交pr