feat: Optimize typeorm to initialize loading entities

[zkamisama]

• 修复 typeorm 配置多数据库时， 初始化加载全部实体问题
• 新增 EntityModel装饰器 新增一个connectionName 参数 指定哪个配置加载该实体

Checklist

• npm test passes
• tests and/or benchmarks are included
• documentation is changed or added
• commit message follows commit guidelines

Affected core subsystem(s)

Description of change

[gitpod-io]

[codecov-commenter]

Codecov Report

Merging #1150 (f3f3938) into 2.x (f4f7a55) will decrease coverage by 0.00%.
The diff coverage is 90.90%.

@@            Coverage Diff             @@
##              2.x    #1150      +/-   ##
==========================================
- Coverage   85.60%   85.59%   -0.01%     
==========================================
  Files         221      221              
  Lines        8808     8824      +16     
  Branches     1748     1752       +4     
==========================================
+ Hits         7540     7553      +13     
- Misses       1206     1209       +3     
  Partials       62       62              

Impacted Files	Coverage Δ
packages/orm/src/index.ts	70.37% <87.50%> (+1.74%)	⬆️
packages/orm/src/configuration.ts	98.00% <92.85%> (-0.89%)	⬇️
packages/core/src/context/requestContainer.ts	96.66% <0.00%> (-3.34%)	⬇️

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[kurten]

缺少测试 case，是否可以加一下呢？

[zkamisama]

缺少测试 case，是否可以加一下呢？

已加