Allows configuration of MongoDB entity indexes

[realLiangshiwei]

Description

Related #19030

https://www.mongodb.com/docs/manual/core/index-case-insensitive/

Checklist

• I fully tested it as developer / designer and created unit / integration tests
• I documented it (or no need to document or I will create a separate documentation issue)

How to test it?

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (042b8e0) 51.60% compared to head (a304688) 51.61%.
Report is 24 commits behind head on dev.

❗ Current head a304688 differs from pull request most recent head 23b80f0. Consider uploading reports for the commit 23b80f0 to get more accurate results

Files	Patch %	Lines
...ongoDB/Volo/Abp/MongoDB/MongoEntityModelBuilder.cs	50.00%	3 Missing ⚠️
....Abp.MongoDB/Volo/Abp/MongoDB/MongoModelBuilder.cs	92.85%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #19073      +/-   ##
==========================================
+ Coverage   51.60%   51.61%   +0.01%     
==========================================
  Files        3095     3095              
  Lines       98215    98231      +16     
  Branches     7849     7851       +2     
==========================================
+ Hits        50682    50703      +21     
+ Misses      45973    45967       -6     
- Partials     1560     1561       +1     

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