Add mysql index of init schema in admin module

[bert82503]

Fixes #5079

Make sure that:

• You have read the contribution guidelines.
• You submit test cases (unit or integration tests) that back your changes.
• Your local test passed ./mvnw clean install -Dmaven.javadoc.skip=true.

[codecov-commenter]

Codecov Report

Merging #5093 (3acaa11) into master (932c8a7) will increase coverage by 0.00%.
The diff coverage is 85.71%.

@@            Coverage Diff            @@
##             master    #5093   +/-   ##
=========================================
  Coverage     61.85%   61.86%           
- Complexity     8498     8501    +3     
=========================================
  Files          1227     1227           
  Lines         36961    36964    +3     
  Branches       3510     3510           
=========================================
+ Hits          22862    22867    +5     
  Misses        12141    12141           
+ Partials       1958     1956    -2     

Files Changed	Coverage Δ
...enyu/admin/model/query/SelectorQueryCondition.java	53.84% <50.00%> (ø)
...he/shenyu/admin/controller/SelectorController.java	100.00% <100.00%> (ø)
...pache/shenyu/admin/mapper/RuleConditionMapper.java	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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