增加 MySQL 实例数据库管理模块

[hhyo]

• 支持创建数据库
• 管理数据库备注和负责人信息
• 将binlog2sql和schemasync移动到单独的小工具目录

[codecov]

Codecov Report

Merging #457 into master will decrease coverage by 0.56%.
The diff coverage is 27.08%.

@@            Coverage Diff             @@
##           master     #457      +/-   ##
==========================================
- Coverage   83.24%   82.67%   -0.57%     
==========================================
  Files          72       73       +1     
  Lines        9383     9479      +96     
==========================================
+ Hits         7811     7837      +26     
- Misses       1572     1642      +70

Impacted Files	Coverage Δ
sql/models.py	95.23% <100%> (+0.11%)	⬆️
sql/urls.py	100% <100%> (ø)	⬆️
sql/instance_database.py	13.92% <13.92%> (ø)
sql/views.py	46% <33.33%> (-0.2%)	⬇️

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