数据库管理和账号管理支持MongoDB

[quanbisen]

新增支持MongoDB类型数据库管理和账号管理，抽取了接口在EngineBase接口中定义，若有需要其它数据库类型的，也可以实现该接口支持。instance_account表新增了字段db_name用作MongoDB存储用户的数据库。

[codecov]

Codecov Report

Patch coverage: 44.80% and project coverage change: -0.09 ⚠️

Comparison is base (f611f03) 75.51% compared to head (c1c4d3b) 75.43%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2108      +/-   ##
==========================================
- Coverage   75.51%   75.43%   -0.09%     
==========================================
  Files         102      103       +1     
  Lines       14910    15105     +195     
==========================================
+ Hits        11259    11394     +135     
- Misses       3651     3711      +60     

Impacted Files	Coverage Δ
sql/instance_account.py	10.59% <1.96%> (+0.15%)	⬆️
sql/instance_database.py	18.27% <5.00%> (-0.83%)	⬇️
sql/utils/instance_management.py	33.33% <33.33%> (ø)
sql/engines/__init__.py	65.34% <50.00%> (-1.69%)	⬇️
sql/engines/mongo.py	61.46% <64.51%> (+0.24%)	⬆️
sql/engines/mysql.py	76.98% <69.23%> (-1.19%)	⬇️
sql/engines/tests.py	99.79% <100.00%> (+<0.01%)	⬆️
sql/models.py	96.57% <100.00%> (+<0.01%)	⬆️

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[hhyo]

感谢贡献，可以先用black处理下lint检测

[quanbisen]

代码已用black格式化

[nick2wang]

新增了不少方法，也更新下单元测试吧，辛苦了👍

[quanbisen]

已更新