feat(mysql): 添加ddl_dml不能同时提交的逻辑

[summingyu]

1. common/templates/config.html: 新增一个配置项ddl_dml_separation, 默认为False, 如果开启, 则不允许DDL语句和DML语句同时执行
2. sql/engines/mysql.py: 增加判断一个sql上线工单中,如果开启ddl_dml_separation, 并且同时存在ddl和dml,则error_count + 1

开启功能之后:

关闭功能之后:

[codecov]

Codecov Report

Base: 75.03% // Head: 75.00% // Decreases project coverage by -0.03% ⚠️

Coverage data is based on head (deaa8af) compared to base (0eee241).
Patch coverage: 36.36% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2060      +/-   ##
==========================================
- Coverage   75.03%   75.00%   -0.03%     
==========================================
  Files         102      102              
  Lines       14809    14820      +11     
==========================================
+ Hits        11112    11116       +4     
- Misses       3697     3704       +7     

Impacted Files	Coverage Δ
sql/engines/mysql.py	78.17% <36.36%> (-1.41%)	⬇️

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